The memo called King the ` ` most dangerous ... effective Negro leader '' in U.S. FBI wiretaps turned up no Communist Party ties , just extramarital affairs . " Martin Luther King Jr. was under the influence of Communists , the FBI kept the civil rights leader under constant surveillance . Edgar Hoover 's contempt for King 's private life shows in private correspondence .
The memo called King the ` ` most dangerous ... effective Negro leader '' in U.S. FBI wiretaps turned up no Communist Party ties , just extramarital affairs . " Edgar Hoover 's contempt for King 's private life shows in private correspondence .