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Telefon is a 1977 spy film directed by Don Siegel and starring Charles Bronson, Lee Remick and Donald Pleasence. The screenplay by Peter Hyams and Stirling Silliphant is based on the 1975 novel by Walter Wager.

Plot

After the Cuban Missile Crisis, the Soviet Union planted a number of long-term, deep-cover sleeper agents all over the United States, who were so thoroughly brainwashed that even they did not know they were agents. They can be activated only by a special code phrase, a line from the Robert Frost poem "Stopping by Woods on a Snowy Evening" – followed by the agent's real first name. Their mission was to sabotage crucial parts of the civil and military infrastructure in the event of war.