Violent attacks involving extremist ideology, like the Buffalo rampage, began to rise in the last decade, but officials were slow to recognize homegrown threats. This is the fourth episode of a five-part series produced in collaboration with The WNET Group’s reporting initiative Exploring Hate.

In the years before Barack Obama was elected, many groups on the extreme right kept a relatively low profile. With the election of a Black president, that changed. This is the third episode of a five-part series produced in collaboration with The WNET Group’s reporting initiative Exploring Hate.

Anti-government propaganda, military deployment and the F.B.I. raid in Waco, Texas, radicalized Timothy McVeigh and led to the Oklahoma City attack. This is the second episode of a five-part series produced in collaboration with The WNET Group’s reporting initiative Exploring Hate.

The killing of radio host Alan Berg exposed a new kind of right-wing extremism. This is the first episode of a five-part series in collaboration with The WNET Group’s reporting initiative Exploring Hate.