IG Farben consisted of the following major companies:
IG Farben committed so many war crimes during the World War II that the allies considered confiscating and putting all of IG Farben out of business. However, in 1951 the company was split up in the original former companies. The four largest quickly bought the smaller ones, and today only Agfa, BASF, Bayer and Hoechst remain. The parent company remained in existence as a trust, holding a few real estate assets, until it was declared bankrupt on November 10, 2003.
During the planning of the invasion of Poland and Czechoslovakia, IG Farben cooperated closely with the Nazi officials, and directed which chemical plants should be secured and delivered to IG Farben.
IG Farben built a factory for producing synthetic oil and rubber (from coal) in Auschwitz, which was the beginning of SS activity and camps in this location during the holocaust. The gas Zyklon B, which was used in the gas chambers for mass murder, was manufactured by Degesch (Deutsche Gesellschaft für Schädlingsbekämpfung), a company owned by IG Farben.
Several of the company officials were sentenced to prison during the Nuremberg Trials.