Adam Czerniaków (30 November 1880 – 23 July 1942) was a Polish engineer and senator who was head of the Warsaw Ghetto Jewish Council (Judenrat) during World War II. He committed suicide on 23 July 1942 by swallowing a cyanide pill, a day after the commencement of mass extermination of Jews known as the Grossaktion Warsaw. Source: Wikipedia (en)