At the La premiere of Going Clear: Scientology, Hollywood, and the Prison of Belief, HBO's new documentary about the Church of Scientology, filmmakers and former members had strong words about the organization -- and its most famous followers.

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The film's producers claim that they reached out to Tom Cruise and John Travolta for interviews, but their requests were allegedly denied. Representatives from the Church said that 25 members were made available to refute every claim made in the documentary but that filmmakers allegedly shunned them. No active members of the religion appear in the documentary.

Director Alex Gibney told The Insider that Cruise and Travolta's influence made it important for him to try to include them.

"They bear a tremendous amount of responsibility because they are key figures for the church in terms of their recruiting," Gibney said. "They owe people an explanation as to why they would be the PR figures...