Original sentence: Between 1950 and 1954, McCarthy gained fame among American conservatives and notoriety among liberals  for aggressively insisting that there were Communist and Soviet spies and sympathizers inside the Federal Government.FBI investigations revealed that in fact, some government officials and State Department employees had been Soviet spies, especially during World War II.He became the most visible public face of this era of anti-Communism, and as a result, Washington Post cartoonist Herblock coined the term McCarthyism in 1950 to describe and condemn his practices.McCarthy stressed the issue of how many more Communist agents were still undetected inside the government.The issue of domestic Communist influence had been a political issue for years in national politics.The issue was heightened after the war with the discovery of Soviet spies in government positions (most notably Alger Hiss)
Edited sentence: Between 1950 and 1954, McCarthy gained notoriety  for aggressively investigating claims that there were Communist and Soviet spies and sympathizers inside the Federal Government.McCarthy became the most visible public face of this era of anti-Communism, and as a result, the term McCarthyism was coined to describe and condemn his practices.The issue of Communist influence and espionage had been a subject of concern for years in national politics, and this concern increased sharply after World War II