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Leah Remini

Charles Sykes/Bravo

Leah Remini has shown her support for the controversial Scientology documentary just hours after Going Clear: Scientology and the Prison of Belief premiered on HBO. 

"Thank you to the brave who did something about it. And to those who didn't have a voice, you do now. #GoingClear," the 44-year-old actress, who made headlines when she left the church in July 2013, tweeted on Sunday night. 

Based on Lawrence Wright's 2013 book, Going Clear: Scientology, Hollywood and the Prison of Belief, and directed by Oscar winner Alex Gibneythe film provides an in-depth look at the religion and includes interviews with former members of the church. 

The documentary premiered at the Sundance Film Festival, where it received widespread critical acclaim, although it was quickly slammed by the organization itself. 

READ: Danny Masterson says critics of Scientology can ''go f--k themselves''

Kelly Preston, John Travolta, Tom Cruise, Scientology

James Borchuck/Tampa Bay Times/ZUMAPRESS.com

"The accusations made in the film are entirely false and alleged without ever asking the Church," Scientology officials said in a statement. "The Church is committed to free speech. However, free speech is not a free pass to broadcast or publish false information."

Additionally, the controversial religion previously launched a Twitter account dubbed Freedom Media Ethics to express their opposition to the film. The account most recently tweeted a number of photos of men and women sleeping in a movie theater while watching the film, with captions such as "HBOring..Zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz..."

MORE: Leah Remini opens up about Scientology to Ellen DeGeneres

Remini made waves when she left Scientology over two years ago, with the Hollywood Reporter citing a source's claim that former King of Queens star had been subjected to years of "interrogations" and "thought modification."

She later issued a statement to People, saying, "I wish to share my sincere and heartfelt appreciation for the overwhelming positive response I have received from the media, my colleagues, and from fans around the world. I am truly grateful and thankful for all your support."

Shortly after her departure, celeb Scientologist Kirstie Alley, who has been a member of the church since 1970, slammed Remini for her claims that she was shunned by member of the church and called her a "bigot." 

READ: Nicole Kidman opens up about Scientology

Leah Remini

Cathy Gibson, PacificCoastNews.com

"When you are generalizing and when your goal is to malign and to say things about an entire group—there are tens of millions of Scientologists in the world—when you decide to blanket statement that Scientology is evil, you are my enemy," she said.  

Seven months after her departure, Remini opened up to Buzzfeed and revealed that she ultimately left the church because of her daughter. 

"In my house, it's family first—but I was spending most of my time at the church," she recalled. "So, I was saying 'family first,' but I wasn't showing that. I didn't like the message that sent my daughter."

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