Since I do enjoy the genre so much, I'd love to know a few that come to mind. Perhaps there may be one or more I would add to my Watchlist
Three Days of the Condor
Alphaville
World on a Wire
The Finger Man
The Red Circle
Tokyo Drifter
The Man Who Knew Too Much
Foreign Correspondent
39 Steps
The Killing
Odd Man Out
Kiss Me Deadly
White Material
Brick
Under the Silver Lake