Few paid much attention when she first turned up at the center of Alibaba Group Holding Ltd.’s packed cafeteria on Friday, a stack of leaflets in one hand and a megaphone in the other.

It had been more than a week since she accused her boss of rape, and she was losing patience.

"An Alibaba executive raped his female employee, but the company has taken no action!” she screamed, handing out the leaflets to stunned colleagues until security guards forcibly removed her. "No one is taking responsibility!”