Social media platforms like Facebook and YouTube are fertile breeding grounds for white supremacists and white nationalists – enabling acts of real-world violence and fueling bigotry – and Big Tech must do more to stop it, advocacy groups that monitor and combat hate and discrimination say.

During a House Judiciary Committee hearing on Tuesday, the Anti-Defamation League (ADL) and other organizations detailed how tech platforms have fueled an uptick in hate crimes against Muslims, immigrants, African-Americans and Jews by enabling perpetrators to self-radicalize, locate extremist hate groups and find like-minded users.

Facebook and Google, meanwhile, defended measures their companies have taken in the wake of horrific incidents such as the Tree of Life Pittsburgh synagogue shooting and the New Zealand mosque massacre, both of which were allegedly perpetrated by gunmen who espoused white supremacist or white nationalist views online.

Read more: Fox News