Isaiah Washington Says Shonda Rhimes Blames Racism for His 'Grey's Anatomy' Firing

Isaiah Washington insists he was ousted from "Grey's Anatomy" in 2007 over false accusations fueled by an allegedly racist ABC exec ... and he says Shonda Rhimes knows it too, and has his back.

The actor tells us Shonda -- creator and exec producer of 'Grey's' -- has "nothing good to say" about ABC or its exec VP, Howard Davine. He also says Shonda believes Davine should be investigated for his "racist, biased behavior."

What Isaiah's suggesting is pretty explosive. First, that the stories about him making homophobic comments on the 'Grey's' set were lies to get him blackballed in Hollywood. Second, Shonda, the queen of TGIT, taking a stand against ABC says a lot.

She's the network's biggest content creator, and if she's calling out one of its execs ... y'know she's pissed.

Isaiah says a whistleblower tipped him off to Davine's alleged actions, and now he's hoping the Time's Up movement or others get on board with his fight.