Final answer:
The House Un-American Activities Committee (HUAC) investigated individuals connected with the film Song of Russia for their political ideologies and actions.
Step-by-step explanation:
The group later investigated the political ideology and actions of many people associated with the film Song of Russia was the House Un-American Activities Committee (HUAC). After World War II, the push against perceived Communist influences intensified, leading to scrutiny of Hollywood by the HUAC. In 1947, subpoenas were issued to individuals in the film industry, and those who refused to cooperate could face imprisonment and blacklisting, effectively ending their careers.