Joseph Losey - The Assassination of Trotsky (1972)

Mexico City, 1940. Leon Trotsky (Richard Burton), the exiled founder of Russia's Communist revolution lives in constant fear of assassination. Moscow shows its control of Mexico's Communist movement by encouraging anti-Trotsky rallies, and on May 24 an attempt by armed gunmen to storm his house fails by fault of its own lack of organization. Trotsky continues to call for the overthrow of Stalin while his cheerfully long-suffering wife Natalia Sedowa (Valentia Cortese) maintains a cordial household for special guests. Trotsky's followers supplement the house's defenses, and a special security man comes down from the United States to help out. Meanwhile Gita Samuels, one of Trotsky's secretaries (Romy Schneider) has a new boyfriend, a mysterious businessman named Frank Jacson (sic) (Alain Delon). Frank is actually an agent for Stalin, waiting for the right time to pounce.