betrayer, blabber, informer, squealer
bum, crumb, dirty dog, git, lowlife, puke, rotter, scum bag, skunk, so-and-so, stinker, stinkpot
blackleg, scab, strikebreaker
betray, denounce, give away, Grass, shit, shop, snitch, stag, tell on
blackleg, fink, scab
