He then served in the United States Army in Europe during World War II.
[3] Prettyman served as law clerk to United States Supreme Court justices Robert H. Jackson, Felix Frankfurter, and John Marshall Harlan II.
In 1962, he negotiated an agreement with Fidel Castro to secure the release of prisoners involved in the Bay of Pigs invasion.
He served as special counsel to the United States House of Representatives Ethics Committee in the 1980s involving the Abscam investigation.
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