Hong Kong(CNN) During the week, Ricky pilots passenger jets traveling around the world for one of Hong Kong's flagship airlines, Cathay Pacific. But when the weekend arrives, he sheds his pilot cap and blazer in exchange for a face mask and helmet, and goes out to join the anti-government protests which have dominated the semi-autonomous Chinese city over the past four months.

Ricky spoke to CNN using a pseudonym on condition of anonymity. He says his double life as a pilot and a protester is exhausting, but he says it's worth the risk to be part of what he sees as a battle to save his city.

"I (had) been acting as a so-called 'aggressive' protester," Ricky says. "My role was to extinguish all the tear gas, in order to protect other citizens and protesters as well."

But recently, Ricky says he has changed his role from a frontline protester to a first aid volunteer. The threat of losing his job loomed large following Cathay's decision to implement stringent new rules outlawing staff from attending any protests deemed "illegal" by authorities.

"Fear is spreading," Ricky says. "You can tell the company is being torn apart and starting to break down."

Staff morale is at an all-time low, he says. Everybody is paranoid. "Basically, I think there's no trust between crews and office staff as well right now, everybody (is) scared," he says.

Cathay Pacific -- an iconic Hong Kong brand -- has come under scrutiny from China after months of protests in the city, which were sparked by a proposed extradition bill with China but have morphed into a broader anti-government movement. Three of the biggest marches brought more than a million people onto the streets, according to organizers. Dozens of smaller protests have been held throughout the summer, many of them turning violent, with police firing tear gas and rubber bullets, and protesters throwing bricks and petrol bombs.

In mid-August, Cathay announced they would be adhering to a new directive issued by China's Civil Aviation Administration which banned employees from working on flights in China if they supported "illegal protests." In the same week, several days of protests at Hong Kong's International Airport ended in chaos, forcing the cancellation of hundreds of Cathay flights. Cathay's CEO, Rupert Hogg, and Paul Loo, the chief commercial officer stepped down a few days later.

On August 28, Cathay Pacific issued a revised version of its employee Code of Conduct, seen by CNN, which includes sections on social media posts, and encourages employees to "speak up" if they see breaches of the code as part of a "whistleblowing" policy.

Since then, Cathay staff tell CNN that dozens of people have been fired from the company.

In response to a request from CNN, Cathay Pacific said that every staff dismissal is made in accordance with relevant employment contracts. Their statement added that the company is required to follow the regulations "prescribed by the authorities in mainland China...there is no ground for compromise."

Protesters take part in a rally to support Cathay Pacific staff in Hong Kong after some of the airline's staff were sacked for supporting opposition to a controversal extradition bill.

Whistleblowing culture

Now, the mood at the company is "very somber," according to another Cathay pilot, Jack, who also spoke to CNN on condition of anonymity.

"The majority are extremely supportive of the movement, but not all," Jack says.

Those who aren't, he adds, are now denouncing their colleagues.

"Some cabin crew support the government, and have given fellow workers' names to the company who have talked about supporting the protests and thence been terminated," Jack says. "The company has actively asked for whistleblowers to come forward, creating a divide amongst fellow employees."

The result, he says, is an increasing culture of fear.

"Everyone has deleted chat groups and social media (profiles) that have any mention of the protests," Jack says. "The cabin crew don't even want to talk about the protests in the open, let alone admit they attend protests."

Over the past few months, Cathay flights landing in China have also become subject to extra inspections by airport officials, Jack says.

"Checking every safety compliance of our aircraft in China is now very common," he says. "They are intense and stressful for crew."

Crew members are also going through extra scrutiny when they arrive in mainland China, he adds.

"Security checks have increased in intensity, personal phones have been inspected," Jack says. "Crew now leave their phone at home or take a second 'China' phone to work."

Many workers at Cathay have a name for this increasing unease: 'white terror.' They say it is seeping into every aspect of the business.

"In terms of the white terror, I would say it feels unsafe, it's uncertain," Cathay staff member Paul tells CNN, on condition of anonymity. "We wouldn't know if it's our last day today, because tomorrow when we come in, we may not even be able to get into the building anymore."

The phrase 'white terror' dates back to the French Revolution, and is often used to describe the mass persecution of dissidents in political crackdowns, including Taiwan's decades of martial law until 1987.

Paul believes that Cathay's drive to encourage whistleblowing has hallmarks of Chinese-style communism.

"(It) is almost like China's cultural revolution, you encourage people to sell out their peers," he says. "People can take your words or take your things out of context and they can still report you."

Hong Kong unrest A riot policeman sprays pepper spray at a man as they disperse a crowd during a demonstration against "parallel traders" who buy goods in Hong Kong to resell in mainland China on Sunday, January 5. Pro-democracy supporters hold placards as they take part in a New Year's Day rally on Wednesday, January 1 in Hong Kong. Pro-democracy supporters wave flags during a countdown party in Tsim Sha Tsui district on New Year's Eve. Police arrive to conduct a clearance operation in the Kowloon district of Hong Kong on December 31. Protesters take photos of a 'Free HK' light display at a gathering in the Central district of Hong Kong on December 30. A man is detained by riot police during a demonstration in a shopping mall at Sheung Shui district on December 28. A protester reacts after police fire tear gas to disperse bystanders in the Jordan district of Hong Kong, early on December 25. 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Protesters walk past barricades of bricks on a road near the Hong Kong Polytechnic University on November 14. Demonstrators gather during a lunchtime protest in the financial district of Hong Kong on November 14. A protester releases a flaming arrow to light a barricade at The Chinese University of Hong Kong (CUHK), Wednesday, November 13. A Molotov cocktail, a gas mask and a yellow construction helmet are placed upon a bust of late hotel tycoon Hui Yeung Shing at the campus of The Chinese University of Hong Kong on November 13. A fire is seen at a Mass Transit Railway (MTR) station during a demonstration at The Chinese University of Hong Kong on November 13. Students attempt to clear tear gas canisters fired by riot police onto a sports track during a confrontation at the Chinese University in Hong Kong on Tuesday, November 12. A man is detained during a protest at the Chinese University of Hong Kong on November 12. Students block an escalator with chairs in an attempt to hamper police at the University of Hong Kong on November 12. A protester is detained in the Central District of Hong Kong on November 11. People react after tear gas was fired by police during a protest in Hong Kong's Central District on November 11. Riot police face off with protesters at an entrance of a shopping mall during a demonstration on November 10. A man is helped by a volunteer medic after police used pepper spray during a demonstration on November 10. Students of the Hong Kong University of Science and Technology (HKUST) participate in a march on November 8, after hospital officials confirmed the death of student Chow Tsz-lok , 22. Police say Chow, a computer sciences student at HKUST, fell from the third floor to the second floor of a parking garage in the residential area of Tseung Kwan O in the early hours of November 4. 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A China Construction Bank is seen vandalized in the Causeway Bay area of Hong Kong on October 6. Pro-democracy protesters set fires in the street in the Causeway Bay area. People protest the ban against masks on Saturday, October 5. An anti-government protester stands near a fire on Friday, October 4. Protesters move a statue depicting a protester armed with gas mask, helmet and umbrella on the streets of Hong Kong on October 4. Protesters set a fire at a China Construction Bank. Protesters spray paint slogans at the entrance to a tunnel on October 4. A store is in shambles after being vandalized by protesters. Pro-democracy demonstrators hold up their hands to symbolize their five demands during a rally on October 4. Protesters throw petrol bombs at the gate to the Tsuen Wan police station on Wednesday, October 2. Schoolmates of a student who was shot in the chest by police place their hands on their chests during a protest on October 2. 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A man is detained by Hong Kong police during a protest in the Causeway Bay shopping district on Sunday, September 29. Bus passengers look at a burning barricade lit by pro-democracy protesters in front of the Mong Kok police station on Sunday, September 22. Pro-democracy protesters sing songs and chant slogans during a rally inside a shopping mall on September 22. A pro-China supporter, center, is escorted by police after confronting journalists in Hong Kong on September 15. Pro-government and anti-government supporters chant against one another at a shopping mall in Hong Kong on Friday, September 13. The sign translates to "Stop violence and curb chaos; safeguard Hong Kong." Demonstrators hold up their cell phone lights as they form a human chain at the Peak, a tourist spot in Hong Kong, on September 13. Police escort an injured man after he attacked protesters outside Prince Edward station in Hong Kong on Friday, September 6. Protesters burn paper money to pay their respects to injured protesters. Protesters prepare to clash with police outside the Mong Kok police station on September 6. A protester is detained by police at the Po Lam Mass Transit Railway station on Thursday, September 5. A man watches televisions at a store in Hong Kong as Chief Executive Carrie Lam announces the withdrawal of the extradition bill on Wednesday, September 4. A woman gets emotional on September 4 while paying her respects to protesters who were injured a few days earlier. Demonstrators travel through a railway station during a rally on Tuesday, September 3. Students wearing gas masks and helmets hold a banner that reads "five major demands are indispensable" at St. Francis' Canossian College in Hong Kong. Protesters gather in the bus terminal at Hong Kong International Airport on Sunday, September 1. Hundreds of pro-democracy activists attempted to block transport routes to the city's airport. A passenger walks to the airport on September 1 as pro-democracy protesters blocked a road outside the airport. A protester uses a slingshot outside the Central Government Complex during clashes with police on Saturday, August 31. Thousands of pro-democracy protesters held an anti-government rally one day after several leading activists and lawmakers were arrested in a sweeping crackdown. Protesters light a Molotov cocktail on August 31. Protesters take cover as policemen fire blue-colored water on them. Blue dye can be used to stain and identify masked protesters. A surveillance camera is covered with white paint during protests. An overhead view shows protesters reacting after police fired tear gas on August 31. Pro-democracy activists Agnes Chow and Joshua Wong speak to the media after they were released on bail at the Eastern Magistrates Courts on Friday, August 30. They were arrested earlier the same day in a dragnet across Hong Kong. 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The turnaround within Cathay Pacific is particularly disturbing for people in Hong Kong, given the 73-year-old company has a reputation for excellence -- it was named Skytrax airline of the year four times -- and is a major employer in Hong Kong, with nearly 20,000 locally-based staff.

On a day-to-day level, it has created a working culture that is increasingly hard to bear, says Sam, a Cathay crew member who wished to remain anonymous.

"I would say that in Cathay right now, everybody is kind of in stealth mode," Sam says. "So whatever you do, whatever you say, you look around before you talk on the phone, you look around before you check your phone, and you would think about what you are going to say before you would say it."

Younger members of staff are particularly affected by this internal cultural shift, she says.

"The more junior crews will watch their mouth or just smile and nod because they are so scared to be reported," Sam says.

Cultural shift

Long time staff say no one is exempt from the shifting mood. A senior air steward and union organizer for Cathay Dragon, Rebecca Sy, was one of the first staff members to be dismissed under the new regime.

"At the beginning, I was shocked," Sy says. "Very disappointed, frustrated."

Sy had worked at Cathay Dragon, a low cost subsidiary airline, for 17 years, and says she had a good relationship with the company. She tells CNN she was called into a meeting, asked to identify three screenshots from her Facebook account, and was then fired on the spot.

A senior air steward and union organizer for Cathay Dragon, Rebecca Sy, was one of the first staff members to be dismissed.

She says she has attended some of the authorized protests in Hong Kong, but says her Facebook account did not break the company's code of conduct. In response to CNN, Cathay says they don't comment on individual cases of dismissal.

"It is my first job since my graduation from university," Sy says. "I really loved my job...to me it's very special."

But the mood at the company is changing rapidly, she says, as the staff are "so afraid and scared."

"They are all losing faith, losing hope with this company," Sy says. "(They) can't enjoy the freedom of speech."

It's a pattern that is being repeated at other workplaces in Hong Kong, she says.

"It's not just Cathay (which is) being targeted," Sy says, adding that it is happening in other businesses as well as hospitals and schools in the city.

Cathay is majority-owned by Swire Pacific. The Anglo-Hong Kong conglomerate, which was founded in 1816, maintains a diversified business portfolio -- including a large property portfolio across mainland China.

The company's capitulation to Beijing's demands sends a strong message about the power of China's financial hold over Hong Kong.

Analysts say that the Chinese government is increasing its efforts to control companies and pressure them to conform to the party line.

General Secretary of the Hong Kong Federation of Trade Unions, Lee Cheuk-yan, says that so-called 'white terror' is spreading into other industries.

Lee Cheuk-yan, General Secretary of the Hong Kong Federation of Trade Unions, says he has also seen evidence of so-called 'white terror' in other sectors, including the banking industry.

"This is now widespread in Hong Kong, and something we are very much worried about because our political belief is being compromised," he says. "So if you want a job, if you want to have a secure living, you have to be pro-China....that would be disastrous for Hong Kong."

For many of the staff still working at Cathay, the dramatic change in dynamic has come as a surprise, especially for those who once respected the company's culture and ethos.

"I can say that Cathay Pacific (had) an open-minded culture," Paul says. "I can no longer say the same."

But he says the fear spreading through the company will not change what the staff believe in.

"Freedom of expression, and opinions, and freedom of speech, that's how my family raised me up to be," Paul says. "I am a person, in addition to an employee, so I just think that you might be able to silence us inside a company, but then you cannot just change our mind."