From 1925 to 1932, Schumpeter held a chair at the University of Bonn, Germany. He lectured at Harvard in 1927–1928 and 1930. In 1931, he was a visiting professor at The Tokyo College of Commerce. In 1932, Schumpeter moved to the United States, and soon began what would become extensive efforts to help central European economist colleagues displaced by Nazism.[7] Schumpeter also became known for his opposition to Marxism and socialism that he thought would lead to dictatorship, and even criticized President Franklin Roosevelt's New Deal.[8] In 1939 Schumpeter became a US citizen. In the beginning of WWII, the FBI investigated him and his wife (a prominent scholar of Japanese economics) for pro-Nazi leanings, but no evidence was found of Nazi sympathies.[9][10]