Joseph Harmatz was one of the few remaining Jewish 'Avengers' who carried out an attempted mass poisoning of former SS officers in an American prisoner-of-war camp in 1946 that sickened more than 2,200 Germans, but caused no known deaths.

Seventy years after the most daring attempt of Jewish Holocaust survivors to seek revenge against their former tormentors, the leader of the plot has only one simple regret — that to his knowledge he didn't actually succeed in killing any Nazis.