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Espionage -- United States -- History -- 20th century
Intelligence service -- United States -- History -- 20th century
2
Spies -- United States -- Biography
2
Subversive activities -- United States -- History -- 20th century
2
Communism -- United States
1
Espionage -- United States -- Case studies
1
Espionage -- United States -- History -- 21st century
1
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