German steelmaking armaments firm, founded in the early 19th century, and developed by Alfred Krupp (1812-87) by pioneering the Bessemer steelmaking process. It developed the long-distance artillery used in World War I, and supported Hitler's regime in preparation for World War II, after which the head of the firm was imprisoned. In 1850 Alfred, later known as the `cannon king', moved into the armaments business. Further expansion took place under his son, Friedrich Alfred (1854-1902), and his granddaughter, Bertha (1886-1957). Krupp continued to flourish as two world wars demanded iron and steel. With Germany's defeat 1945, Alfred Krupp (1907-67) was convicted of war crimes, sentenced to 12 years in prison, and ordered to sell 75% of his holdings. When no buyers could be found, Krupp was given a generous amnesty and was soon back in business. The family interest ended shortly after his death when his heir, Arndt, renounced all interest in the business and Krupp became a public corporation.