In 1986 an astronomer traced a $0.75 time discrepancy to German hackers and KGB (alumni.berkeley.edu)

Link is down, here's the google cache: https://webcache.googleusercontent.com/search?q=cache:CzQkMc...

I remember reading an article about this in my childhood, during the early 90s, when the name Chaos Computer Club has stuck in my mind immediately. Strange that it does not get mentioned here.

https://en.m.wikipedia.org/wiki/Chaos_Computer_Club

Quite a book.