Edward Roscoe Murrow was an American broadcast journalist and war correspondent who first gained radio prominence with a series of live radio broadcasts from Europe during WWII.

In the spring of 1954 the US Senate held a series of hearings to investigate conflicting accusations between the US Army and Wisconsin Senator Joseph McCarthy. TV coverage of the hearings contributed to McCarthy’s decline in popularity and his eventual censure by the Senate the following December.

Murrow’s reports on his television program See It Now  helped lead to the censure of Senator McCarthy.

Source: Wikipedia