Winslet, 42, won the Oscar for her role of a former Nazi woman in the post-World War II drama.
Weinstein, who has been accused of sexual harassment by more than 30 women, was known for his lobbying during the Oscars and his name often figures in the 'thank you' speeches of the winners. The film mogul distributed the movie through his studio Miramax Films.
Winslet, however, declined to name him at all, acknowledging 19 others instead. The actor told the Los Angeles Times that she was told she must acknowledge him in her speech.
The actor said she had a difficult relationship with the producer, who would often remind Winslet of his favours.
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"For my whole career, Harvey Weinstein, whenever I've bumped into him, he'd grab my arm and say, 'Don't forget who gave you your first movie'. Like I owe him everything. Then later, with The Reader, same thing, 'I'm gonna get you that Oscar nomination, I'm gonna get you a win, I'm gonna win for you'."
"I can't even begin to describe the disgraceful behavior that went on," Winslet said of Weinstein's actions during the making of the movie.
Last week, Winslet was one of the first people speak out against Weinstein for his alleged harassment of women following a New York Times expose.
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