Nguyễn studied in Paris from 1919 to 23. In those years, he started following communism, and began to believe that Vietnam- then a French colony-should be independent. During this time he wrote a letter, which was ignored, to United States President Woodrow Wilson, asking for U.S. military aid to help overthrow the French colonial rulers. He joined the French Communist Party, and started visiting Moscow regularly, as a member of the Asian branch of the Comintern.