[crote]

You might be interested in the book "The Cuckoo's Egg"!

It describes how in 1986 the compute time accounting at Lawrence Berkeley National Laboratory was off by 75 cents - literal theft of compute time, in other words. Long story short: it was a hacker in Germany, compromising a large number of US government computer systems in order to spy for the KGB.

[Cockbrand]

This is an excellent recommendation for an excellent book. As the hackers were German, the hackers' perspective is somewhat well-known in Germany, and it's interesting to learn about both sides.

I just learned that a documentary on this topic with Cliff Stoll exists: The KGB, the Computer and Me https://www.youtube.com/watch?v=4gHNVNRQTJg - I haven't watched it yet, though.