Bafta had already suspended the producer and on Tuesday Weinstein's wife, British designer Georgina Chapman, said she was leaving him.
Weinstein was labelled "sick and depraved" by his brother, Bob Weinstein, with whom he co-founded the companies Miramax and The Weinstein Company, on Saturday.
Bob told The Hollywood Reporter he had been aware his brother was unfaithful to Chapman but did not know "the type of predator that he was".
He added: "I have a brother that's indefensible and crazy. I want him to get the justice that he deserves."
The Writers Guild Of America West issued a statement on Saturday saying it "stands in solidarity" with the women who have spoken out while the Producers Guild announced they would be meeting to consider expelling Weinstein.