Which Constitutional amendment did the Hollywood Ten cite in order to protect themselves from HUAC and ultimately led to them being dubbed "unfriendly witnesses"?

A) the First Amendment (protects freedom of speech)
B) the Fourth Amendment (protects against unreasonable searches and seizures)
C) the Fifth Amendment (prohibits self-incrimination)
D) the Sixth Amendment (ensures the right to a fair and speedy public trial by jury)

Hollywood Ten

A group of film directors and screenwriters who were blacklisted by Hollywood studios in the 1940s and 1950s after they refused to answer Congressional inquiries regarding their possible communist affiliations.

Constitutional Amendment

A formal change or addition proposed to the Constitution, requiring a specific process of approval and ratification.

Unfriendly Witnesses

Individuals called to testify in a legal setting who are either unwilling or hostile, making their testimonies potentially difficult to obtain or unreliable.