A.C. Thompson, Lucas Waldron & Christopher Mathias

A.C. Thompson is a staff reporter with ProPublica. Lucas Waldron is ProPublica's visual investigations producer. Christopher Mathias is a national reporter at HuffPost, based in New York City.

A police officer carrying an automatic rifle guards the area near Al Noor mosque on March 17th, 2019, in Christchurch, New Zealand.
Social Justice

How YouTube Has Become Fertile Ground for the Spread of Hate

In recent months, YouTube has emerged as something of a flourishing option for white supremacist and neo-Nazi videos—spreading ideas cited by the alleged New Zealand mosque gunman.