Brostrom was credited by some for starting a #MeToo movement at the UN and her complaint that she was sexually assaulted led to two inquiries by UN investigators.
The researchers estimated that in the first three months of the movement, 11,598 additional sexual crimes were reported in the 13 OECD countries.
The film-maker rejected the allegation, but few in French cinema have come out in support of Polanski, who fled to France in 1978 after admitting to raping a 13-year-old girl in LA.
Sandra Muller started a viral hashtag in French in October 2017, #balancetonporc (expose your pig), which called on Frenchwomen to name and shame men in an echo of the #MeToo movement.
She said that by staying silent, she could have avoided being targetted but that would not have been the right thing to do.
Dylan Farrow, Allen's adopted daughter with Farrow, accused the director of sexually abusing her in the early 1990s while she was a child.