TOM CRUISE reportedly made KATIE HOLMES purify her levels in his state-of-the-art Scientology bus made with reputed "slave labor".

Not only that but  Tom  demanded the custom-built bus — made for him using Scientology "slave labor" — be fitted with a drawer for his slippers because the neat-freak didn’t want anyone walking on the carpet, according to a former high-ranking church staffer reported that Cruise also used the luxury vehicle as a base for lover Katie Holmes to begin her Purification Rundown Program, a controversial detoxification and introductory program developed by Scientology’s founder  former sci-fi pulp writer L. Ron Hubbard.

The Church of Scientology gave Cruise Silver Screen — a trailer-style bus — which was reportedly built by their church’s underpaid staffers, who put in nearly 9,000 man hours into the production of the vehicle.

The FBI is investigating the church for human trafficking and using free labor — in part, to service the demands of its celebrity icon Cruise.

In an internal email to Scientology leader Dave Miscavige, purportedly from the Director of Vehicles of the Sea Org branch — the super-secret organization within the church — Cruise’s requests for upgrades to the bus were outlined, according to the church’s former Inspector General Mark Rathbun.

"Mr. Cruise arrived at the Bluebird yesterday on set and said that it was awesome — the interior upgrades and audio visual," the email reads, describing Cruise’s satisfaction at the temporary bus awaiting him while his luxury ‘Silver Screen’ bus was being made.

"He requested that a space be figured out for placement of slippers in the front of Silver Screen as he does not want any shoes on the carpet. This is figured out; there is a drawer right at the entrance which can be used for this."

The bus, allegedly given to Cruise around the time he was shooting Mission Impossible 3, was to be a present from Miscavige, who was also the actor’s best man during his marriage to Holmes, 32.

Despite news of the FBI probe, the church has emphatically denied that any of its staff were ever mistreated.