Yes. A rather well known example: Mark Whitacre was an executive at ADM (Archer Daniels Midland). He turns into a _whistle blower_ about a price fixing scheme around _lycine_ (a livestock feed additive)

However the while this was happening, Whitacre was embezzling millions of dollars. The FBI was able to figure out his crime, in part, from Whitacre's evidence.

There were enough twists and turns in this story that it was made into a movie (_The Informant!_, https://en.m.wikipedia.org/wiki/The_Informant!) that followed the facts of the story pretty closely.