Opposition leader Sam Rainsy says Hun Sen, the authoritarian prime minister, has used Facebook to spread false news stories and death threats directed at political opponents.

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PHNOM PENH, Cambodia — One of Cambodia’s leading opposition figures has asked a federal court in California to force Facebook to reveal details of its dealings with Hun Sen, the country’s authoritarian prime minister, arguing that he has used the platform to manipulate public opinion and strengthen his hold on power.

Lawyers for the opposition politician, Sam Rainsy, filed a petition Thursday in the Northern District of California asking that Facebook be compelled to release records of advertising purchases by Hun Sen and his allies.

Sam Rainsy says Hun Sen has used Facebook to spread false news stories and death threats directed at political opponents. He also alleges that besides generating “likes” by paying for his pages to get targeted promotion, Hun Sen used so-called click farms to accumulate millions of counterfeit ones.

J. Noah Hagey, a partner in the San Francisco-based law firm BraunHagey & Borden, which is representing Sam Rainsy, called the legal action “an opportunity to bring unique transparency to some of the Hun regime’s most insidious methods for controlling and manipulating ordinary citizens.”

Facebook’s political influence around the world had come under scrutiny even before the 2016 election made social media an issue in the United States. Critics say false news stories on Facebook can help people in power unfairly tar their critics. In Asia, Rodrigo Duterte, president of the Philippines, has used Facebook to rail against his critics and bolster support for extrajudicial killings, and others have used it to inflame tensions in places such as Indonesia.

Sam Rainsy’s petition cites leaked emails purporting to show that at one point Hun Sen’s Cambodian People’s Party was paying Facebook $15,000 per day to promote its pages. The filing seeks records of those transactions from Facebook, and it urges the company to assess whether Hun Sen and his allies have been violating the platform’s terms of use.

Sam Rainsy’s case hinges on a so-called Section 1782 discovery, named for a U.S. law stipulating that if a U.S. company is involved in a legal proceeding in another country, a litigant can apply to a U.S. court for evidence that could be used in that proceeding.

Genevieve Grdina, a spokeswoman for Facebook, declined to comment directly on the petition, but she said that anyone with a public Facebook page could purchase targeted ads to reach particular audiences, and that Facebook has made every possible effort to identify and eliminate click farms and fake pages.

Hun Sen, who has been in power for 33 years, has overseen an extensive crackdown on dissent and opposition as national elections scheduled for July approach. The country’s main opposition party has been dissolved, its leaders — including Sam Rainsy, 68, who lives in exile in France — have been driven into exile or jailed, and independent news media have been shut down.

Hun Sen nearly lost Cambodia’s last national elections, in 2013, to Sam Rainsy’s party, which used Facebook to appeal to young people and to skirt government restrictions on his access to traditional media. The opposition recruited a team to report and broadcast news shows entirely on Facebook, and used young social-media stars to drum up attendance at anti-government protests. The opposition and its supporters also used the site to spread false rumors and racist claims about Vietnamese people living in Cambodia.

Hun Sen seemed to learn his lesson. The premier and his family assembled a team to disseminate pro-government propaganda and pour money into promoting their own pages on Facebook, which is one of the country’s most popular sources of information. Government ministries, all of which are run by Hun Sen’s party, were ordered to form “Facebook working groups,” and officials were told to start their own personal pages to interact with the public.

However Hun Sen’s “likes” were generated, his Facebook page has more of them than any other in Cambodia. On it, he intersperses policy dictates and slick propaganda videos with slices of everyday life: photographs of him in an undershirt on the beach, in bed with his wife, and hugging garment-factory workers. In speeches posted to his page, he rails against his political opponents and threatens that war will ensue if he loses power.

Duong Dara, who manages Hun Sen’s Facebook presence, said Sam Rainsy’s petition revealed a misunderstanding of the nature of advertising. “You can see many billboards on the street, and people are willing to pay for more advertising, and it brings more business,” Duong Dara said. “ … It’s not like you are stealing or you are trying to get fake ‘likes’ and fake whatever.”

He said emails about huge Facebook ad spending by the Cambodian government were “fake information.”

Sam Rainsy has lived overseas since 2015 after being bombarded with lawsuits that would see him jailed for years if he were to return. He was convicted of defamation after complaining the prime minister appeared to be purchasing Facebook “likes” from India and the Philippines, and was prosecuted for comments made on the site.