Oops, I didn't know that was illegal
The central element of MCI’s scheme, people involved in the inquiry said, consisted of disguising long-distance calls as local calls to avoid paying special access tariffs to local carriers across the country.
“Everyone understood that we were stiffing Bell Atlantic, but I did not consider whether it was illegal,” one design engineer who formerly worked at MCI said in a sworn statement provided to investigators. “We were told that Project Invader was an exploitation of a tariff loophole, a trick. We kept the project a secret. The traffic was ramped up slowly to avoid detection.”