In 2004, Yahud-In Unum was created to facilitate understanding and collaboration between Catholics and Jews. “Yahad-In Unum” is derived from the word “unity” in both Hebrew and Latin.

The founders of YIU were Cardinal-Jean Marie Lustiger, former archbishop of Paris, Cardinal Philippe Barbarin, archbishop of Lyon, Cardinal Jean-Pierre Ricard, archbishop of Bordeaux, Rabbi Israel Singer, former President of the World Jewish Congress, Mr. Serge Cwajgenbaum, secretary-general of the World Jewish Congress and Mr. Pinchas Shapiro.

Yahud-In Unum’s largest initiative is an ambitious, multi-year effort to systematically identify and document every single site of Jewish mass execution by Nazi mobile killing units in Eastern Europe during the World War II. The objective of the work is three-fold: to substantiate this “Holocaust by bullets,” to discount Holocaust deniers of today and tomorrow and to give the fallen a respectful burial.