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Proving that they have no concept of irony, an Antifa-affiliated group intent on shutting down the showing of a film that documented Antifa violence was successful in doing so — thanks to threats of violence.

The documentary film in question is called “America Under Siege: Antifa,” and was produced by the Capital Research Center, which describes itself as an “investigative think tank.” It was scheduled to be played today to coinside with Milo Yiannopoulos’ “Free Speech Week” at the University of California, Berkeley.

Yiannopoulos ended up making only a brief appearance on the liberal campus yesterday afternoon, and what was intended to be a four-day event celebrating the First Amendment had to be called off thanks to a series of bureaucratic headaches.

Meanwhile, according to Campus Reform,

The threat of violence from Antifa has resulted in the cancellation of a film premiere set to expose that very same organization.

The student organization sponsoring Free Speech Week, The Berkeley Patriot, has filed a civil rights complaint against the administration, alleging that it was “systematically and intentionally violating” its First Amendment rights, according to The Daily Californian.

As a result, The Patriot was forced to pull its sponsorship of the event, leaving Yiannopoulos and his free-speech extravaganza at the wayside, with America “Under Siege: Antifa” among the casualties.

Although the film will still premiere Tuesday night on the One America News Network, the Capital Research Center published a Saturday press release expressing its extreme disappointment with the cancellation.

“The disruption of the film’s premiere is extremely disappointing. Worse, it is a major blow to the First Amendment right to free speech,” the group stated. “Let’s be clear: Antifa shut down a film screening criticizing their own extremism by using fear.”

Following the cancellation, the Capital Search Center made their film available online free of charge on YouTube.

The film features interviews with a number of figures from the right, including Milo himself, Lauren Southern and Gavin McInnes, among others. As always is the case, the film will garner more views now than had Antifa not successfully shut it down in the first place.

[Note: This post was written by Matt Palumbo. He is a co-author of the new book A Paradoxical Alliance: Islam and the Left, and can be found on Twitter @MattPalumbo12]