In a tense hearing Tuesday morning, representatives from Google and Facebook joined advocacy group members to discuss the impact of white nationalism’s spread online, in the wake of violent hate crimes in the U.S. and New Zealand sparked, in part, by groups on social media.

The House Judiciary Committee hearing got off to a rough start—one that inadvertently highlighted the need for a discussion on online hate speech. Before a YouTube livestream of the hearing even began, accounts filled a live comment section with calls to “end Jewish supremacy,” spewing racist and anti-Semitic hate speech. After about a half hour, YouTube suspended the chat.