First off, wow, Tom Cruise finally found a heavyweight who's shorter then he is...anyway, apparently part of the backstory on his exit from Paramount involves this run in with Scientology members (thanks Radar):
According to a high-ranking media executive, Paramount Pictures honcho Grey had a highly unpleasant run-in with the Church during his tense negotiations with Cruise over Mission: Impossible 3. Grey, who had recently joined the studio, entered the talks determined to make Cruise accept a smaller share of the gross revenues than he had from the first two installments in the franchise. (For those films, the actor reportedly took home an unheard-of 30 percent of the total revenue.) Leaving the office one night, the diminutive Grey, walking to his car in the Paramount lot, suddenly found himself surrounded by more than a dozen Scientologists, who pressured him to ease up on the actor, according to the source.
