A former Bosnian prison camp supervisor and accused war criminal — living in a Boston suburb for decades — has been charged with lying about being a refugee and claiming US citizenship.

The war, from 1992 to 1995, killed an estimated 100,000 people and displaced 2.2 million others. About 8,000 Bosniak men and boys, primarily Muslims, were killed in the July 1995 Srebrenica massacre.

The Bosnian war has been investigated and documented in great detail, particularly by the United Nations tribunal for former Yugoslavia in The Hague, which heard from more than 4,500 witnesses and ...