Diddy says the feds are trying to take him down purely because he's a successful Black man, and they're using a law that's been "racist" since its inception to do it ... according to new documents. Diddy's attorneys filed docs Tuesday asking the judge to dismiss count 3 of the U.

Mr. Combs has been singled out because he is a powerful black man, and he is being prosecuted for conduct that regularly goes unpunished,” declares a Tuesday filing by the incarcerated Sean “Diddy” Combs to toss out the government’s claim the Bad Boy Records founder violated the Mann Act,