How did Whittaker Chambers affect the anti-communist movement?

Whittaker Chambers affected the anti-communist movement because he was an anti-communist writer, who spied the communists and shared all their secrets. He became respected by the American people during the 1950s.

At first, he was a member of the Communist Party and Soviet spy but then, he changed his mind and became an outspoken anti-communist.

Moreover, he was the accuser of Alger Hiss in the famous series of hearings and trials.