Bryan Fogel made the investigative documentary “The Dissident” to shine a light on alleged free-speech suppression efforts by the Saudi government.

Now his film could be a target of the very forces it seeks to expose.

“The Dissident” saw as many as 500 low audience scores, out of just 2,400, flood the popular film-rating site Rotten Tomatoes on Jan. 12, filmmakers said, an act they believe came from trolls operating on behalf of the Saudi government to create a false sense of popular dissatisfaction. The movie’s approval rating soon plummeted from above 95 percent to just 68 percent.

A similar trend has appeared to unfold on the movie site IMDb, which has seen 1,175 one-star reviews flood the site since Saturday. In the previous month, the movie rarely collected more than a few dozen such scores in a given day; many more users gave it the highest rating.

“The Saudis have been proving the thesis of the film — they do in fact have an army,” said Thor Halvorssen, founder and chief executive of the nonprofit Human Rights Foundation, which funded the movie. He said the sudden surge of poor ratings for a film that was generally well-liked by both audiences and critics struck him as highly suspicious.

The trolling effort, Halvorssen says, could threaten the public standing of “The Dissident” — and the likelihood that Americans would watch it. Review sites are critical for many political documentaries, which without massive marketing budgets rely heavily on word-of-mouth buzz. It’s also a reminder that online disinformation isn’t just about political campaigns.

Fogel, the Oscar-winning director of “Icarus,” offers in “The Dissident” a searing criticism of the government of Crown Prince Mohammed bin Salman, set against the backdrop of the killing of Washington Post columnist Jamal Khashoggi.

Released in theaters last month and on-demand Jan. 8, the film paints a portrait of a regime that will go to violent lengths to silence its critics. It also documents “the flies,” scores of people working on behalf of Mohammed to keep positive topics about him trending and bad news out of sight, creating a culture bereft of opposition voices. Until last week it had received warm reviews from both professional critics and citizen filmgoers on various film sites.

After being contacted by The Washington Post on Tuesday, a Rotten Tomatoes spokesman, Tiyson Reynolds, acknowledged that the company suspected manipulation.

“Based on recent analysis, it appears that there have been deliberate attempts to manipulate the movie’s audience score,” Reynolds said. He noted the company “will be removing manipulative ratings from the system and may continue to do so as they are discovered.” As of Wednesday afternoon, the audience score remained at 68 percent, based on 2,387 reviews. It had not changed in at least two days.

Rotten Tomatoes uses an audience-scoring system in which consumers can rate movies between one and five stars. The site then assigns a “fresh” score if 60 percent of raters give a movie at least 3.5 stars. If they don’t, the film is designated as “rotten.”

While “The Dissident” has not yet descended to that status, a score below 70 percent often makes viewers write off a film. Even a tepidly received movie like the recently released “Wonder Woman 1984” currently has a Rotten Tomatoes audience rating of 74 percent.

IMDb, meanwhile, uses a one-to-10-star system. For much of the time since its release, “The Dissident” had garnered high marks on the site, with more than 5,000 users out of 9,200 giving it nine or 10 stars, and just 700 users giving it one star. But beginning Saturday, at least 1,175 one-star reviews poured in. They now account for 20 percent of all audience ratings.

The movie’s overall audience score on IMDb has remained steady at around 8.2 stars, possibly the result of algorithms that discount rafts of one-star reviews. (IMDb is owned by Amazon, whose chief executive, Jeff Bezos, owns The Post. Bezos is also featured in “The Dissident” as an alleged hacking victim of Mohammed.)

But the individual reviews associated with the low scores have remained visible on the site. A one-star review on Tuesday under the heading “One side documentary,” posted by a user known as “mesh-41593,” noted that “the documentary was from one side only which is not giving everything of it. It seems like it is written from someone’s point of view which made it look like a one side story. The whole truth weren’t in the film. not recommended.”

Another, from “mesh-60618,” said in its one-star review Tuesday that “Documentary Films are always based on reality which I didn’t see in this one. I didn’t see anything about Khashoggi on this documentary. Even his family didn’t participate. I’m not gonna recommend it to anyone.” Khashoggi and his fiancee Hatice Cengiz are heavily featured in the movie.

An IMDb spokesperson did not immediately return a request for comment.

It is not the first time the Saudi government has cast a shadow over the release of “The Dissident.” Though the film received rave reviews at the 2020 Sundance Film Festival last January, global streamers passed on acquiring it, possibly because they feared reprisals from Mohammed’s government. The movie is being released in the United States by an independent company, Briarcliff Entertainment.

Rotten Tomatoes has been caught in the crossfire of troll campaigns before. Two years ago, for example, the site was the apparent subject of a campaign by people unhappy with Disney’s approach to “Star Wars: The Last Jedi.” The move prompted Rotten Tomatoes — which is owned by Fandango, a subsidiary of Comcast — to bolster its audience-review requirements, obligating those who rate a movie to verify that they bought a ticket to it. Reynolds said that ratings for “The Dissident” did not require proof of a theatrical ticket because the movie is also available on-demand.

Troll campaigns pose a challenge for movie-review sites in a similar way that extremist political voices can vex social media companies: The platforms don’t want to become a hotbed of misleading speech. But they are also reluctant to appear like they are muzzling users.

Halvorssen says he believes review sites carry a responsibility to make sure only honest voices are heard. Without their active policing of trolls, he says, those who oppose democratic voices will achieve their aim of suppressing them.

“The idea that the truth will win out is a romantic notion,” he said. “It’s nice, but it’s romantic. I’m not confident the truth will win out if we don’t help the truth.”