Sydney sandwich board activist Danny Lim has been arrested and fined for offensive behaviour.

Three police officers arrested the 74-year-old at Exchange Place in Barangaroo about 9.20am on Friday. It’s unclear what the offensive behaviour involved.

Video of the arrest shows an officer holding a sandwich board sign that reads: “SMILE CVN’T! WHY CVN’T?”

Local icon Danny Lim - best known for calling Tony Abbott the c-word - was recorded calling out for help as police took one of his well-known signs away from him in Sydney today. pic.twitter.com/R90HRejjmr — SBS News (@SBSNews) January 11, 2019

In August 2017 Lim successfully had a 2015 conviction and $500 fine for offensive conduct overturned over a sandwich board that mocked the then-prime minister Tony Abbott with a rewriting of the word “can’t”.

District court Judge Andrew Scotting said it was unlikely the sign would offend the average Australian.

Witnesses to Friday’s arrest criticised police for the manner in which Lim was arrested.

“I saw police officers use a completely unnecessary and unacceptable amount of force to arrest Danny for wearing a humorous sign,” Christina Halm posted on Facebook.

“There was a crowd of at least 30 who had stopped in their tracks once we realised what was happening, clearly all shocked, gasping and crying at what we were seeing.”

Niki Anstiss said Lim was trying to make people smile.

“This is disgusting,” she wrote. “I saw 3 police officers brutally rip his sign from his back and arrest him while he was screaming for them to not take his sign. He did nothing wrong.”

New South Wales police declined to comment when asked about the physicality of Friday’s arrest.