The correct answer is C Many careers were ruined. In 1947 member of the House Un-American Activities Committee started an investigation against communist influences in the film industry. With the communist fear the Americans had the committee subpoenaed actors, directors, studios to declare about the political affiliation they took part of and name the other communist in the industry. The ones that refused to help were blacklisted by their employers. They lost their professions and were efficiently prohibited from working in their selected industry.