Final answer:
The historical figures related to espionage and Cold War activities mentioned in the question are the House Committee on Un-American Activities (HUAC), Rosenberg, Klaus Fuchs, and Alger Hiss.
Step-by-step explanation:
The historical figures related to espionage and Cold War activities mentioned in the question are:
- House Committee on Un-American Activities (HUAC): A congressional committee tasked with investigating alleged instances of subversion and disloyalty among federal employees.
- Rosenberg: Julius and Ethel Rosenberg, who were executed in June 1953 after being accused of passing information to the Soviet Union.
- Klaus Fuchs: German-born physicist who worked on the Manhattan Project and was convicted of passing nuclear secrets to the Soviets.
- Alger Hiss: Former State Department official accused of spying for the Soviet Union.