A direct role isn't a decisive/major/detemerning role, but anyway nice copy/paste from the US propoganda machine:
© 2018 Created by the Roy Rosenzweig Center for History and New Media at George Mason University with funding from the U.S. Department of Education (Contract Number ED-07-CO-0088)|
Well for a start you could google "Fordwerke during ww2" (Henry ford) "standard oil ww2" (Rockefeller) "union banking corporation" (Prescott Bush) "IBM helping nazis" (Thomas Watson) - and see for yourself.
Perhaps the most prolific one was General Motors:
Here's my copy/paste:
https://en.wikipedia.org/wiki/General_Motors
During
World War II, GM produced vast quantities of armaments, vehicles, and aircraft for the
Allies of World War II. In 1940, GM's
William S. Knudsen served as head of U.S. wartime production for
President Franklin Roosevelt and by 1942, all of GM's production was to support the war.
[48] GM's
Vauxhall Motors manufactured the
Churchill tank series for the Allies, instrumental in the
North African campaign.
[17] However, its
Opel division, based in Germany, supplied the
Nazi Party with vehicles. Sloan, head of GM at the time, was an ardent opponent of the
New Deal, which bolstered
labor unions and
public transport, and Sloan admired and supported
Adolf Hitler.
[49][50] Nazi armaments chief
Albert Speer allegedly said in 1977 that Hitler "would never have considered invading Poland" without
synthetic fuel technology provided by General Motors. GM was compensated $32 million by the U.S. government because its German factories were bombed by U.S. forces during the war.
[51]
Effective January 28, 1953,
Charles Erwin Wilson, then GM president, was named by
Dwight D. Eisenhower as
United States Secretary of Defense.
[17]
WAR MONGERS.