Verified answer

The Bourne Trilogy. I'm sure they're many great spy classics (Notorious, The Spy Who Came In From The Cold) but the Bourne movies are my favourite. It's like a disheveled game of cops and robbers but with an askew definition of right/wrong -- a sound parable for the post-Cold War world I guess.

Three Days of the Condor (1975)

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any James bond movie

(except the ones with Daniel Craig)