During the McCarthy era Mr. Seeger’s political affiliations, including membership in the Communist Party in the 1940s, led to his being blacklisted and later indicted for contempt of Congress. The pressure broke up the Weavers, and Mr. Seeger disappeared from television until the late 1960s. But he never stopped recording, performing and listening to songs from ordinary people. Through the decades, his songs have become part of America’s folklore".
http://www.nytimes.com/2014/01/29/arts/ ... .html?_r=1