Krupp AG, also known as Fried. Krupp, former German corporation that was one of the world’s principal steelmakers and arms manufacturers until the end of World War II. For the rest of the 20th century it was an important manufacturer of industrial machinery and materials. It became a limited-liability company in 1968 when its assets were transferred from the private ownership of the Krupp family to the Alfried Krupp von Bohlen und Halbach Foundation. The corporation merged with Thyssen AG in 1999, creating ThyssenKrupp AG, a leading global manufacturer of steel, construction materials, automotive parts and assemblies, and industrial and mechanical services.