Breach

That one was a good one. It's about the biggest leakage of the CIA in USA history. An old agent that was spying in Soviet Union, a very good computer genius, that knew many things about computer security in CIA. He gave away many important informations.
The chiefs knew about that but they didn't have any proofs. It was young mans task to get them, and to close the leak down.
A very good movie based on true story from 70's of 20th century.