[3] Between 1934 and 1953, Uphaus ran an organization called the National Religion and Labor Foundation, which supported labor unions and advocated civil rights and racial equality[4] He remained committed to pacifist causes during World War II, and in 1950 served as a delegate to the World Peace Conference in Warsaw.
It was there in 1954, amidst the height of McCarthyism, that he was pressured by New Hampshire Attorney General Louis Wyman to surrender a list of all attendees of World Fellowship Center.
Uphaus voluntarily met with Wyman several times in 1954 in a futile attempt to clarify that he had never officially been a member of any explicitly Communist party, but the attorney remained firm in his demand that Uphaus produce a list that included the addresses and contact information of all attendees, speakers, and employees at World Fellowship.
The case reflected a major first amendment challenge to McCarthyism and was the subject of a supreme court decision, Uphaus v. Wyman, 79 S.Ct.
In 1961, Uphaus resumed his directorship position at World Fellowship, authored an autobiography entitled Commitment in 1963 and retired in 1969.