"From what I've read on this, pertty much all of the attacks (I cant think of a better word right now) happened to actresses at the start of their career. So yes they all kept their mouths shut for fear of their careers being destroyed before they get started."
The recordings of Weinstein released via The New Yorker reveal him making what are not-so-veiled threats to an actress if she doesn't let him molest her.
“Don’t embarrass me in the hotel. I’m here all the time….You’ll never see me again after this, if you embarrass me in this hotel,”
“Five minutes. Don’t ruin your friendship with me for five minutes.”
Of course "never seeing him again" would mean "never working for him again" which given his grip over production and distribution would mean being excluded from a broad range of work.