GENEVA (Reuters) - Beijing is waging a campaign of harassment against Chinese activists who seek to testify at the United Nations about repression, while the world body sometimes turns a blind eye or is even complicit, Human Rights Watch said.

FILE PHOTO: Security cameras are attached to a pole in front of the giant portrait of former Chinese Chairman Mao Zedong on Beijing's Tiananmen Square, near the Great Hall of the People where the 18th National Party Congress (NPC) is currently being held, November 11, 2012. REUTERS/David Gray

In a report released on Tuesday, the group said China restricts travel of activists, or photographs or films them if they do come to the U.N. in Geneva to cooperate with human rights watchdogs scrutinizing its record.

“What we found is that China is systematically trying to undermine the U.N.’s ability to defend human rights, certainly in China but also globally,” Kenneth Roth, executive director of Human Rights Watch, told Reuters.

“This comes at a point where domestically China’s repression is the worst it has been since the Tiananmen Square democracy movement (in 1989). So there is much to hide and China clearly attaches enormous importance to muting criticism of its increasingly abysmal human rights record.”

Chinese foreign ministry spokesman Geng Shuang dismissed the report’s accusations as “groundless”, saying Beijing was playing an active role in the United Nations’ human rights work.

“We urge the relevant organization to remove their tinted lenses and objectively and justly view China’s human rights development,” he told a regular briefing.

Rolando Gomez, U.N. Human Rights Council spokesman, said the office did its best to protect all participants and had been “extremely vigilant in addressing and investigating all acts and perceived acts of intimidation, threats, and attacks brought to its attention”, regardless of which state committed them.

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The U.N. system offers one of the few remaining channels for Chinese activists to express their views, the New York-based rights group said.

Its report, “The Costs of International Advocacy: China’s Interference in United Nations Human Rights Mechanisms,” is based on 55 interviews.

“NIP-IT-IN-THE-BUD STRATEGY”

“(Chinese President) Xi Jinping seems to have adopted a ‘nip it in the bud’ strategy with respect to activism at home, but increasingly abroad. That’s one of our messages, China’s repression isn’t stopping at its borders these days,” Roth said.

In China, activists have “decreasing space safe” from intimidation, arbitrary detention, and a legal system controlled by the Communist Party, the report said, decrying a crackdown on activists and lawyers since 2015.Some activists who have attended U.N. reviews of China’s record have been punished on their return, it said. Others have their passports confiscated or are arrested before departure.

When Xi addressed the U.N. in Geneva in January, the U.N. barred non-governmental organizations (NGOs) from attending, Human Rights Watch said.

Dolkun Isa, an ethnic Uighur rights activist originally from China, was attending a U.N. event in New York in April when U.N. security guards ejected him without explanation, despite his accreditation, it added.

Jiang Tianyong, a prominent human rights lawyer, disappeared last November, months after meeting in Beijing with U.N. special rapporteur on poverty Philip Alston who has called for his release.

Jiang, after being held incommunicado for six months, was charged with subversion. At his trial last month he confessed, saying that he had been inspired to overthrow China’s political system by workshops he had attended overseas.

“So the signal is clear - don’t you dare present an independent perspective to a U.N. investigator,” Roth said.