A riveting exposé in BuzzFeed shows how Steven K. Bannon and Milo Yiannopoulos smuggled Nazi and White Nationalist ideas into the American mainstream.

According to reporter Joseph Bernstein, “new emails and documents, however, clearly show that Breitbart does more than tolerate the most hate-filled, racist voices of the alt-right. It thrives on them, fueling and being fueled by some of the most toxic beliefs on the political spectrum — and clearing the way for them to enter the American mainstream.”

It’s a relationship illustrated most starkly by a previously unreleased April 2016 video in which Yiannopoulos sings “America the Beautiful” in a Dallas karaoke bar as admirers, including the white nationalist Richard Spencer, raise their arms in Nazi salutes.

These documents chart the Breitbart alt-right universe. They reveal how the website — and, in particular, Yiannopoulos — links the Mercer family, the billionaires who fund Breitbart, to underpaid trolls who fill it with provocative content, and to extremists striving to create a white ethnostate.

They capture what Bannon calls his “killing machine” in action, as it dredges up the resentments of people around the world, sifts through these grievances for ideas and content, and propels them from the unsavory parts of the internet up to TrumpWorld, collecting advertisers’ checks all along the way.

Watch as Milo and other white supremacists have a bit of karaoke fun. Then read the BuzzFeed story.