Beghe began to publicly criticize the Church of Scientology in April 2008.
He participated in an interview about his experiences as a Scientologist; a clip of that interview was published online by Scientology critic Mark Bunker in mid-April 2008.
In the video, Beghe asserted that Scientology was "very dangerous for your spiritual, psychological, mental, emotional health and evolution".
The clip ended with Beghe stating, "I don't have an agenda.
I'm just trying to help. [...]
I have the luxury of having gotten into Scientology and after having been in it, been out.
And that's a perspective that people who are still in and not out do not have."
Marina Hyde of The Guardian has called Beghe a Scientology celebrity whistleblower.

On April 28, 2008, Beghe posted online a letter to Church leader David Miscavige.
In the letter, he requested the confidential confessional files that Scientology compiles during Auditing sessions.
Beghe told The Village Voice that these confidential files are kept on actor Tom Cruise and other celebrity Scientologists.

Beghe has asserted that Scientology's practice of disconnection was still in place as of 2008.
In an interview with Tony Ortega of The Village Voice, Beghe stated that the expulsion of his four-year-old son from a Scientology school was an example of disconnection.
Beghe has turned down opportunities to speak about his experiences with Scientology on television; he says, "I just wanted to make sure that the story isn't about me.
It's not about me.
It's about helping others who are still lost in the cult, or toying with the idea of getting involved."

On May 29, 2008, Beghe attended a protest against the Church of Scientology held outside the Scientology building on East 46th Street in New York City.
In September 2008, Beghe traveled to Europe where he spoke with government officials in Hamburg, Germany, about his experiences as a Scientologist.
Beghe suggested that governments put up warning signs about Scientology that are similar to warnings placed on packs of cigarettes; the next day, a member of Germany's Interior Department told him such a sign was placed outside a Church of Scientology building in Berlin.

Beghe was a guest in May 2009 on the BBC World Service radio program World: Have Your Say, where he discussed his views on what he thought of Scientology when he first joined: "I thought that it was something that was going to deliver miracles, and that it was the most selfless group of people that were totally dedicated to helping mankind, and I wanted to be part of it."
He was also critical of Scientology leadership: "I think that there are probably things of Scientology that are valuable and that can help people - my main issue is not with Scientology per se, it is with Scientology the organization - it is a corrupt I believe and probably a criminal endeavor, and that has to do with people who are in charge of Scientology mainly David Miscavige..."
In September 2010, Beghe took part in a BBC News Panorama documentary, The Secrets of Scientology, in which he spoke about his decision to leave the organization.
Beghe also appeared in the 2015 HBO documentary Going Clear, based upon the book of the same name by Lawrence Wright.
Beghe began to publicly criticize the Church of Scientology in April 2008. He participated in an interview about his experiences as a Scientologist; a clip of that interview was published online by Scientology critic Mark Bunker in mid-April 2008. In the video, Beghe asserted that Scientology was "very dangerous for your spiritual, psychological, mental, emotional health and evolution". The clip ended with Beghe stating, "I don't have an agenda. I'm just trying to help. [...] I have the luxury of having gotten into Scientology and after having been in it, been out. And that's a perspective that people who are still in and not out do not have." Marina Hyde of The Guardian has called Beghe a Scientology celebrity whistleblower.
On April 28, 2008, Beghe posted online a letter to Church leader David Miscavige. In the letter, he requested the confidential confessional files that Scientology compiles during Auditing sessions. Beghe told The Village Voice that these confidential files are kept on actor Tom Cruise and other celebrity Scientologists. 
Beghe has asserted that Scientology's practice of disconnection was still in place as of 2008. In an interview with Tony Ortega of The Village Voice, Beghe stated that the expulsion of his four-year-old son from a Scientology school was an example of disconnection. Beghe has turned down opportunities to speak about his experiences with Scientology on television; he says, "I just wanted to make sure that the story isn't about me. It's not about me. It's about helping others who are still lost in the cult, or toying with the idea of getting involved."
On May 29, 2008, Beghe attended a protest against the Church of Scientology held outside the Scientology building on East 46th Street in New York City. In September 2008, Beghe traveled to Europe where he spoke with government officials in Hamburg, Germany, about his experiences as a Scientologist. Beghe suggested that governments put up warning signs about Scientology that are similar to warnings placed on packs of cigarettes; the next day, a member of Germany's Interior Department told him such a sign was placed outside a Church of Scientology building in Berlin.
Beghe was a guest in May 2009 on the BBC World Service radio program World: Have Your Say, where he discussed his views on what he thought of Scientology when he first joined: "I thought that it was something that was going to deliver miracles, and that it was the most selfless group of people that were totally dedicated to helping mankind, and I wanted to be part of it." He was also critical of Scientology leadership: "I think that there are probably things of Scientology that are valuable and that can help people - my main issue is not with Scientology per se, it is with Scientology the organization - it is a corrupt I believe and probably a criminal endeavor, and that has to do with people who are in charge of Scientology mainly David Miscavige..."
In September 2010, Beghe took part in a BBC News Panorama documentary, The Secrets of Scientology, in which he spoke about his decision to leave the organization. Beghe also appeared in the 2015 HBO documentary Going Clear, based upon the book of the same name by Lawrence Wright.
Jason Beghe