In 1927, McManus started to work for
The New York Times as a copy boy, police reporter, writer on
bridge, and movie reviewer. In 1937, McManus resigned from the
Times to join the staff of
Time magazine as radio critic. In 1940,
William Saroyan lists him among "contributing editors" at
Time in the play, ''Love's Old Sweet Song''. In 1949, McManus co-founded the
National Guardian, a progressive newspaper, with fellow former
Times writer
James Aronson. The paper was critical of the
Cold War and
McCarthyism and supportive of the
labor movement and
racial equality. He would co-edit the paper until his death in 1961. In November 1955, McManus and Aronson were among 26 former and current
New York Times employees subpoenaed by the
Senate Internal Security Subcommittee. The subcommittee was investigating
Communist infiltration in the American media. The subpoenas were based upon the testimony of
Winston Burdett, a famous
CBS war correspondent. In 1956, McManus testified, citing
Fifth Amendment protections to avoid naming names or admit any knowledge of Communist activities. ==Personal life and death==