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Paul Thomas Anderson’s film “The Master” — said to be based on the Church of Scientology — nearly swept the Venice Film Festival over the weekend and generated big buzz in Toronto. But behind-the-scenes sources say the church has been ratcheting up its opposition to the movie — prompting distributor Harvey Weinstein to beef up his own security, The Post reports.

Even though Anderson and star Philip Seymour Hoffman insist in interviews their film isn’t about the controversial religion, sources say Scientologists have been “inundating” the distributor, The Weinstein Co., with strange calls objecting to the film and are concocting plans to combat it when the film is released this week.

“The Master” stars Hoffman as an enigmatic church leader and Joaquin Phoenix as an early disciple.

Sources tell The Post that Scientology is countering the film’s marketing by running its own ads promoting its message in places where ads and stories about “The Master” appear.

Calls and mail from people believed to be Scientologists to Weinstein’s office have grown numerous enough that some on the film’s team have hired extra security, a source said. Weinstein had already been under close guard following a recent attempt to blackmail him by a man unrelated to the film.

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Go to The Post for the full report.