In 1921, while waiting for his internship to begin at Bellevue Hospital, Hammer went to the Soviet Union for a trip that lasted until late 1930. Although his career in medicine was cut short, he relished being referred to as "Dr. Hammer." Hammer's intentions in the 1921 trip have been debated ever since. He has claimed that he originally intended to recoup $150,000 in debts for drugs shipped during the Allied intervention, but was soon moved by a capitalistic and philanthropic interest in selling wheat to the then-starving Russians. In his passport application, Hammer stated that he intended to visit only western Europe. J. Edgar Hoover in the Justice Department knew this was false, but Hammer was allowed to travel anyway. The twenty six year old Hoover, who was the Justice Department's expert on subversives, was tipped off that Armand Hammer was a courier for the COMINTERN and ensured that foreign intelligence agencies were notified of Armand Hammer's travels. A skeptical U.S. government watched him through this trip and for the rest of his life.