Don Larson worked for the Scientology Finance Police in the early 1980s. In this excerpt from a 1987 BBC documentary he speaks about how David Miscavige got physical with an Org Executive in San Francisco.
This has nothing to do with religion anymore. This is “where’s the money, Jack? I want the money! Where did you put the money?”
He said “I don’t know! I don’t have the money!”
So David Miscavige comes up, grabs him by the tie, and starts bashing him into the filing cabinets.
The whole segment is interesting. The physical violence starts at 1:28.
Bear in mind this documentary is from 1987. Hubbard died in 1986.