How were some large corporations in the United States helping the Nazi efforts at world domination?

The Germans spent years consolidating the interests of their industrial concerns in the United States. Infiltration came through their businesses which became an area of interest to Stevenson. Stevenson dealt with companies like Standard Oil who had a relationship with I.G. Farben, through publicity. Many big companies were doing business with the Nazis through their foreign subsidiaries and the BSC prepared a four-hundred page report on this. This also involved a battle against American labor leader John L. Lewis.