Famously QWEST refused to cooperate with the NSA's warrantless wiretapping efforts a few years ago, and claimed that they lost large government contracts as a result. See http://www.dslreports.com/shownews/Qwest-Punished-For-Wireta... for verification.
I've heard of someone through an acquaintance whose company gets something like $60 mill in revenue from one of those iffy agencies of the US. It's nothing to sneeze at.
Officially, I think it's called the "brown nose" business model.