Driven by outrage and a resolve to correct a power imbalance that seemed intractable just months ago, 300 prominent actresses and female agents, writers, directors, producers and entertainment executives have formed an ambitious, sprawling initiative to fight systemic sexual harassment in Hollywood and in blue-collar workplaces nationwide.
Called Time’s Up, the movement was announced on Monday with an impassioned pledge of support to working-class women in an open letter signed by hundreds of women in show business, many of them A-listers. The letter also ran as a full-page ad in The New York Times, and in La Opinion, a Spanish-language newspaper.

“The struggle for women to break in, to rise up the ranks and to simply be heard and acknowledged in male-dominated workplaces must end; time’s up on this impenetrable monopoly,” the letter says.