Cyanide Gas Gun
A gas gun similar to this one was used by KGB officer Bogdan Stashinsky to assassinate two Ukrainian dissidents — Lev Rebet and Stepan Bandera — in Germany in 1957 and 1959.
The gun, which Stashinsky concealed in a rolled-up newspaper, exploded hydrogen from a crushed cyanide capsule into the victim's face, causing him to go into cardiac arrest.
Stashinsky later defected to Germany and confessed to the crimes.
Kiss of Death
For the spy-op gone bad, or simply for any Natscha who found herself out to dinner with the date from hell, this Cold War-era KGB lipstick gun delivered the kiss of death with a single 4.5mm shot.