Longreads

The call from Guatemala put Oscar on edge.

Prosecutors came looking for you, relatives in his rural hometown told him. Big shots from Guatemala City. They want to talk to you.

Oscar Alfredo Ramírez Castañeda had plenty to lose. Although he was living in the United States illegally, the 31-year-old had built a solid life. He worked two full-time jobs to support his three children and their mother, Nidia. They had settled in a small but cheerful townhouse in Framingham, Mass., a blue-collar suburb of Boston.

In some ways, it was just one more bloody episode in a blood-soaked country. In the early hours of the morning on May 11, a group of indigenous people traveling by canoe on a river in the northeast…