But today, New York City prosecutors dropped one of the charges against Weinstein, after they found evidence - a "written account" from a fact-checker for The New Yorker - that contradicted previous statements about the encounter between Weinstein and one of those three main women in the case.
Lucia Evans claims Weinstein forced her to perform oral sex on him in 2004, but new information revealed on Thursday casts doubt on Evans' story.
The letter also said prosecutors had recently obtained an email that Evans wrote in 2015 to the man she later married.
Weinstein's lawyer, Benjamin Brafman, unsuccessfully urged Judge James Burke to deep-six the whole case, telling him: "The integrity of these proceedings has been compromised".
The judge also released a letter from the district attorney's office to Brafman.
"We know of no evidence refuting our client's report that Harvey Weinstein forcefully sexually assaulted her", she said in a statement. Weinstein had promised to get her an acting job if she agreed to perform oral sex and she agreed.
The witness had given the different account to a NY police officer who had failed to tell prosecutors, the letter added. "Some of the most vocal, outspoken critics of Mr. Weinstein have put their opinions into the media" without a legitimate legal claim, he argued. "Nothing in this disclosure impacts the strength of the remaining case and the other five counts", she said, including the most serious count, for predatory sexual assault.
The developments in Weinstein's case on Thursday capped a tough six-day stretch for the #MeToo movement, bookended by Supreme Court Justice Brett Kavanaugh's confirmation amid decades-old allegations that he had committed sexual misconduct.
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The case includes rape and sexual assault charges.
Ms Evans' lawyer, Carrie Goldberg, claimed that the prosecutors' decision not to oppose the dismissal of the charge had seen them "abandon" her client.
Mr Brafman told the judge that Ms Evans had lied to both a grand jury and to The New Yorker about her encounter with Weinstein.
Hollywood film producer Harvey Weinstein enters Manhattan criminal court in NY, where he pleaded not guilty to rape and sex assault charges.
About six months later, prosecutors interviewed the pal, who said that she was with Evans at a Manhattan bar in the summer of 2004 when Weinstein offered the women "cash if they exposed their breasts to him".
The witness alleges that Evans later agreed to give Weinstein oral sex in exchange for a movie role.
In July, a Manhattan grand jury voted to charge Weinstein with additional counts of sexual assault, stemming from what prosecutors deemed a forcible sexual act against a third woman in 2006. Days later, The New Yorker published the first in a series of articles in which women brought forth allegations of rape, sexual assault, and sexual harassment against the film executive.
Film producer Harvey Weinstein arrives at Manhattan Criminal Court for his hearing in N.Y., October 11, 2018.