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John P. Finnegan (1926-2012) was the actor who portrayed Warren T. Rat in An American Tail. He was born on Augest 18th 1926 to Irish immigrant parents his first role was as Frank in Play Is As It Lays (his first credited role) his first non credited one according to his idmb page was dirty harry as a voice in that movie.
He was known the most by his role as warren t rat the main antagonist of an american tail according to his idmb page.
He was also in the natural and many other films.