People went to jail or paid fines or were otherwise dissuaded (Prescott Bush comes to mind)...
"WASHINGTON - After 60 years of inattention and even denial by the U.S. media, newly-uncovered government documents in The National Archives and Library of Congress reveal that Prescott Bush, the grandfather of President George W. Bush, served as a business partner of and U.S. banking operative for the financial architect of the Nazi war machine from 1926 until 1942, when Congress took aggressive action against Bush and his 'enemy national' partners.
"The documents also show that Bush and his colleagues, according to reports from the U.S. Department of the Treasury and FBI, tried to conceal their financial alliance with German industrialist Fritz Thyssen, a steel and coal baron who, beginning in the mid-1920s, personally funded Adolf Hitler's rise to power by the subversion of democratic principle and German law.
"Furthermore, the declassified records demonstrate that Bush and his associates, who included E. Roland Harriman, younger brother of American icon W. Averell Harriman, and George Herbert Walker, President Bush's maternal great-grandfather, continued their dealings with the German industrial baron for nearly eight months after the U.S. entered the war... " (Bush - Nazi Link Confirmed)
The grandfather of President George W. Bush (Skull & Bones, 1968) was Prescott Bush (Skull & Bones, 1917), and his great grand father was George Herbert Walker. Prescott Bush and George Herbert (Bert) Walker were directors of the London-affiliated New York banking house of Brown Brothers-Harriman and its various fronts, which funded and directed the military-industrial complex behind Hitler and the Nazi revolution. In 1919, George Herbert Walker had organized W.A. Harriman & Co which merged with the British Brown Brothers in 1931. In 1924, Averell Harriman (Skull & Bones, 1913) and Fritz Thyssen, the German industrialist who began funding Hitler in 1923, set up the Union Banking Corp in New York to handle funds supplied to it through Thyssen's Dutch bank for American investment. Prescott Bush, who had been an officer of the W.A. Harriman bank since 1926, was a director of the Union Banking Corp from 1934 through 1943. According to government documents, "all of the shares of the Union Banking Corp., were held for the benefit of members of the Thyssen family."
The federal government did not crack down on the Bush-Harriman/Nazi operation until 1942. After the war, Congressional investigation revealed that Fritz Thyssen's German Steel Trust, Germany's largest industrial corporation, which interlocked with Union Banking Corporation, produced a high percentage of Germany's national output of metal products and explosives. Vesting Orders signed by the Office of Alien Property Custodian, Leo T. Crowley, which were "published in obscure government record books and kept out of the news, explained nothing about the Nazis involved; only that the Union Banking Corporation was run for the 'Thyssen family' of 'Germany and/or Hungary'-- 'nationals...of a designated enemy country.'"
In October 1942, ten months after entering World War II, America was preparing its first assault against Nazi military forces. Prescott Bush was managing partner of Brown Brothers Harriman. His 18-year-old son George, the future U.S. President, had just begun training to become a naval pilot. On Oct. 20, 1942, the U.S. government ordered the seizure of Nazi German banking operations in New York City which were being conducted by Prescott Bush.
Under the Trading with the Enemy Act, the government took over the Union Banking Corporation, in which Bush was a director. The U.S. Alien Property Custodian seized Union Banking Corp.'s stock shares, all of which were owned by Prescott Bush, E. Roland 'Bunny' Harriman, three Nazi executives, and two other associates of Bush. 1.
'E. Roland Harriman--3991 shares'
'Cornelis Lievense--4 shares'
'Harold D. Pennington--1 share'
'Ray Morris--1 share'
'Prescott S. Bush--1 share'
'H.J. Kouwenhoven--1 share'
'Johann G. Groeninger--1 share'
"all of which shares are held for the benefit of ... members of the Thyssen family, is property of nationals ... of a designated enemy country...." http://watch.pair.com/reich.html