Randy Jackson -- MJ Executors are 'Criminals'

Randy Jackson just came out swinging against the people in charge of the Michael Jackson Estate -- claiming the executors are "criminals" who falsified documents for their own personal gain ... but it's looking like Randy's plot is quickly crashing and burning.

Jackson just spoke with Al Sharpton on MSNBC's "Politics Nation" ... and tried to explain why he and his siblings are trying to overthrow John Branca and John McClain.

"We feel there is criminal misconduct," Jackson said ... claiming the executors had a hand in faking MJ's will ... and Randy believes he can prove it because Michael was in NY on the day he supposedly signed the document in L.A.

Problem is ... Randy's argument has a GIANT flaw ... the "mistake" he's pointing to is based on a witness who merely forgot what city he was in at the time the will was signed.

There are witnesses who saw MJ sign the will ... and it has been validated by the court.

But even if Randy and his siblings were to get the will invalidated ... MJ's old will cuts them out of MJ's fortune too ... and it appoints Branca executor.

Multiple sources tell TMZ ... the situation is simply a money grab by MJ's siblings who know that once Katherine Jackson dies ... MJ's money goes in trusts for his kids. Randy and co. will never get a dime.