VIDEO : Frontline's 'Weinstein' Shows Mogul's History

A special "Frontline" presentation timed to the Oscars, "Weinstein" is a methodical tick-tock of the sexual-harassment allegations against Harvey Weinstein, and most significantly, how and why they were allowed to go unchecked for so long. Yet while essentially recapping the details, the hour falls short in providing further clarity to the key question: What did Hollywood, collectively, know, and when did it know it?