An untold story of the civil rights movement.

“Massacre in El Salvador,” a collaboration with Frontline and ProPublica, tells the story of the worst massacre in recent Latin American history, and why a final reckoning is at risk.

Flavia Battistiol has turned to social media in hopes of being reunited with the sibling who disappeared in 1977, when the military junta ruled Argentina.

According to experts who monitor the radical right, the white supremacist ideology that police say drove the Buffalo gunman has begun moving from the extremes into the mainstream. This is the fifth episode of a five-part series produced in collaboration with The WNET Group’s reporting initiative Exploring Hate.