Joseph Weisberg, Joel Fields, and Joseph Weisberg stated that the Mitrokhin Archive was a rich source information for the show's storyline, especially a sleeper agent marrying an "asset" to extract intelligence. Vasili Mitrokhin, was the head archivist for the KGB, who was responsible for the coordination and cataloging of the Archive from its obsolete location on Lubyanka Street to a more modern facility on the outskirts of Moscow (which took three years to build). During the transition period (ten years before the fall of the Soviet Union), he transcribed the Archives by hand and hid it under the floorboards of his dacha (vacation home) on the weekend. After the fall of the Soviet Union, he shopped his notes around to various Western Embassies in Latvia. The British expressed interest, and MI6 conducted an operation to retrieve the intelligence from his dacha.
In one episode they put a body in the trunk of a Chrysler Imperial and when they get to their destination, it's a New Yorker.