The Mossad, short for HaMossad leModi'in uleTafkidim Meyuchadim (meaning "Institute for Intelligence and Special Operations"), is the national intelligence agency of Israel. One of their activties has been the apprehension or elimination of Nazi war criminals.
After awakening from his cryogenic slumber, the criminal Pruneface intended to flee to South America. He was met on his airplane by a Mossad agent and taken into custody. Additionally, other agents arranged for the explosion at Dr. Kryos Freezdrei's lab which killed the other Nazi "sleepers" that he had in suspended animation. Before the explosion, an agent warned Sam Catchem that Dick Tracy was being held at the lab, and gave Catchem enough time to free Tracy before the lab blew up.