Cackle-bladder

1951 June 16, Racket Squad (television review), in The Billboard, page 8, It tells you how they work on the mark's own larcenous cravings for a killing, how they build him up to betting his entire stake — and then "put the chill on" via the "cackle bladder" routine, a prop murder, so named because originally the "corpse" bit on a chicken bladder and drenched himself in chicken blood.

Source: wiktionary

Use a cackle bladder to bite on and spit blood whether faced with a gang or a single assailant. This is often enough to dissuade would-be aggressors […].

Source: wiktionary

It's a trick con men call the cackle-bladder. You take a little bag made from a pig's bladder and fill it up with chicken blood, and keep it inside your mouth until it's time to play dead.

Source: wiktionary

"A cackle-bladder," she murmured. "A what?" "It's a way to deal with the violent ones. You make them party to the consequences of violence, make them believe they've murdered someone."

Source: wiktionary