01/12/2014 10:47 am ET Updated Jan 23, 2014

Toiling To Bring Rwanda Genocide Suspects To Justice

TONY KARUMBA via Getty Images

REIMS, France — ABOVE his desk in a peaceful and tidy townhouse with pots of geraniums hanging from the windowsills and walls covered with photos of his children, Alain Gauthier keeps 24 files labeled with the names of some of the men and women accused in one of the most appalling crimes of the 20th century.

Mr. Gauthier and his wife, Dafroza, have been collecting information for 13 years on each of the 24 Rwandan men and women they suspect of having participated in their country’s 1994 genocide. The suspects are members of the Hutu ethnic group who now lead comfortable lives in France and deny any involvement in the slaughter of more than 800,000 people — most of them Tutsi — in just 100 days.