https://en.wikipedia.org/wiki/Room_641A https://en.wikipedia.org/wiki/Room_641A I looked at this briefly for a security module for my MSc and from what I vague

https://en.wikipedia.org/wiki/Room_641A https://en.wikipedia.org/wiki/Room_641A I looked at this briefly for a security module for my MSc and from what I vaguely recall they were tapping roughly half of all data going through AT&T on the West coast