Michael Jackson's personal assistant has filed a class action lawsuit against AEG, claiming he and the rest of the employees connected with the "This Is It" tour lost lots of money because the company negligently hired and supervised Dr. Conrad Murray.

Michael Amir Williams claims in his lawsuit, obtained by TMZ ... AEG agreed to pay MJ's staff up to $7.5 million for their services connected with the tour ... a tour that didn't take place because Dr. Conrad Murray pumped the singer with a fatal dose of Propofol.

Williams alleges AEG screwed up by failing to act responsibly by hiring Murray and then failing to properly manage or supervise him.

Williams is asking for unspecified damages.