The NRA hired “a self-described ‘research consultant,’ who for decades has covertly infiltrated citizens groups for private security firms hired by corporations that are targeted by activist campaigns” to infiltrate gun-control and environmental organizations.
See There’s Something About Mary: Unmasking a Gun Lobby Mole,

Mary McFate was a prominent gun control activist. Mary Lou Sapone was a freelance spy with an NRA connection. They are the same person. A Mother Jones investigation.

My question: WHO ELSE?
Watch your backs. Really.