What was the objective of the House Un-American Activities Committee?

It was to investigate protestors that burned the American flag.

It was to review the applications of refugees seeking political asylum.

It was to remove communists from the United States government.

It was to eliminate foreign diplomats with ties to terrorist organizations.

The objective of the House Un-American Activities Committee was to remove communists from the United States government.

Explanation:

The House Un-American Activities Committee (HUAC) was a committee set up by the House of Representatives from 1938 to 1975. The committee's work initially focused on investigating Americans of German descent and their possible involvement in Nazi activities and the Ku Klux Klan, but increasingly focused on mapping alleged communist infiltration into various US organizations.  

In the mid-1940s, many famous people were persecuted, for example, Charlie Chaplin, Bertold Brecht, Paul Robson and others. In 1947, the commission began the persecution of Hollywood figures. A number of filmmakers were sent out summons demanding to attend public hearings, many of them were included in the "black list".

The correct answer is D)

It was to remove communists from the United States government.

Explanation:

The House Un-American Committee (also known as HUAC) was instated  in 1938 to investigate alleged disloyalty and subversive activities on the part of private citizens, public employees, and those organizations suspected of having Fascist or Communist ties.

Why? did America as this time pursue anti-communist ideology?

Since 1945, US leaders have pointed, with depressing regularity, to Soviet actions as proof that communism is an evil force destined to spread around the globe unless stopped by a firm hand.