Organisation Todt (OT) was a civil and military engineering organisation in Nazi Germany from 1933 to 1945, named for its founder, Fritz Todt, an engineer and senior Nazi. The organisation was responsible for a huge range of engineering projects both in Nazi Germany and in occupied territories from France to the Soviet Union during World War II. It became notorious for using forced labour. From 1943 until 1945 during the late phase of the Third Reich, OT administered all constructions of concentration camps to supply forced labour to industry.