Spy: Let Mindslaves See Who Other Mindslaves Are

[Embolism]

The only problem, I guess, is that you can't capture an enemy mindslave, replant them as your own and send them back as an undercover agent.

.....

Oh who are we kidding, no one plays Spy subtly as it was seemingly designed to be played and every spy round is basically an "everyone's a rampaging traitor" round.