Lange emigrated to the United States in 1937, was a professor at the [[University of Chicago]] from 1938, and became a U.S. citizen in 1943. Lange served as a go-between for [[Franklin Delano Roosevelt]] and [[Joseph Stalin]] during the post-war discussion on Poland. Lange returned to the United States at the end of May, met with [[Polish government in exile|Free Polish London Exile]] Prime Minister [[Stanisław Mikołajczyk]], who happened then to be in Washington, and stressed how reasonable Stalin was prepared to be, and asked the State Department to pressure on the exiled Poles. Lange's covername with the [[KGB]] was FRIEND. | Lange emigrated to the United States in 1937, was a professor at the [[University of Chicago]] from 1938, and became a U.S. citizen in 1943. Lange served as a go-between for [[Franklin Delano Roosevelt]] and [[Joseph Stalin]] during the post-war discussion on Poland. Lange returned to the United States at the end of May, met with [[Polish government in exile|Free Polish London Exile]] Prime Minister [[Stanisław Mikołajczyk]], who happened then to be in Washington, and stressed how reasonable Stalin was prepared to be, and asked the State Department to pressure on the exiled Poles. Lange's covername with the [[KGB]] was FRIEND. |