Extensive online biography with hyperlinks by William Ruhlmann in the All Music Guide.
In 1948, Fred formed the Weavers with Seeger, Ronnie Gilbert and Lee Hays. Hellerman wrote and co-wrote some of their hits. Because of his involvement with left-wing groups during the 1930s and 1940s, Fred came under suspicion of Communist sympathies during the McCarthy era.
In 1950, Fred Hellerman was named, along with the rest of the Weavers, in the anti-communist tract Red Channels and was placed on the industry blacklist. The Weavers, unable to perform on television, radio, or in most music halls, broke up in 1952.