The online hate mob of Gamergate is good at two things: Sending horrible threats to women online, and forcing people to shut down events featuring people critical of Gamergate.

A year ago this month, feminist critic Anita Sarkeesian was forced to cancel a speech at Utah State University because someone threatened to commit “the deadliest school shooting in America history.” Now, South By Southwest Interactive organizer Hugh Forrest says the festival is canceling two sessions on the topic that were on next year’s schedule, citing “numerous threats of on-site violence related to this programming.”

Gamergate, for the uninitiated, is a loose online community that arose last year and targeted a number of prominent women in the gaming industry. It purports to be countering what it sees as unfair criticism of gaming and gamers, specifically charges that games often depict women in demeaning ways. Its biggest homes are sites like Reddit, 4chan, 8chan and other message boards. People affiliated with Gamergate claim that they’re fighting for ethics in gaming journalism, but they’ve accomplished little aside from threatening women online and menacing advertisers on sites critical of Gamergate.

The two canceled panels — “SavePoint: A Discussion on the Gaming Community” and “Level Up: Overcoming Harassment in Games” — were put together by two different groups, and they were to cover different topics.