Whom did private eye Matt Helm work for?

Played by Dean Martin, Matt Helm was a secret service agent for ICE (Organization for Intelligence and Counter-Espionage).

The four Matt Helm movies were: The Silencers (1966), Murderer’s Row (1966), The Ambassadors (1967), and The Wrecking Crew (1969).

The character is taken from a series of novels by Donald Hamilton.