Seeger was a member of the Communist Party before WW II when Stalin and Hitler signed a peace treaty. When asked how he could be friends with the Nazis, Seeger said he was trying to prevent the WW II Really? He did not succeed.so well. Also Seeger showed his anti-antisemitism is the famous Newport Festival in 1965 when he insulted a Jewish musician called Bob Dylan.
from the article: Pete Seeger officially joins anti-Israel boycott