Answer
Joseph McCarthy, a powerful Senator, became Murrow's primary adversary in the pursuit of honest journalism. During the Cold War era of the 1950s, McCarthy led a crusade against alleged communist infiltration in the U.S. government, known as McCarthyism. Murrow, through his influential television program "See It Now," confronted McCarthy's tactics, exposing his unsubstantiated accusations and aggressive methods, which ultimately contributed to McCarthy's downfall and decline in public support.