IG Farben was a German chemical industry conglomerate. Its name is taken from Interessen-Gemeinschaft Farbenindustrie AktienGesellschaft (Plc Syndicate [literally, "community of interests"] of dye-making corporations). The company was formed in 1925 from a number of major chemical companies that had been working together closely since World War I. During its heyday, IG Farben was the largest chemical company in the world and the fourth largest overall industrial concern, after General Motors, U.S. Steel, and Standard Oil of New Jersey.