Milovan Djilas was a prominent figure in Yugoslav politics during the Cold War era. He was a close associate of Josip Broz Tito, the leader of Yugoslavia, and served as a high-ranking official in the Yugoslav government. However, Djilas' experiences in the communist system led him to become disillusioned with its ideology and practices. He began to question the true nature of communism and its effects on society, which ultimately led to his expulsion from the Yugoslav Communist Party.