The ‘Shill’ Gambit come in an argument or disagreement when one side accuses the other of being a paid shill for the cause. For example, accusing them of secretly working for a running shoe company and promoting their product or a pharmaceutical company. It generally is used when the person doing the accusing is loosing an argument or arguing from a weak position.

Most Useful Resources:
Shill Gambit (PodiaPaedia)
“All anti-barefoot running research is paid for by the running shoe companies” (Running Research Junkie)