ERNST L. FREUD, Sigmund Freud's youngest son, died in London on April 7, 1970. After his retirement as an architect, Mr. Freud devoted his time to editing his father's correspondence. He was the editor of Letters of Sigmund Freud and of Sigmund Freud-Arnold Zweig Briefwechsel, and co-editor of Sigmund Freud-Oskar Pfister: Briefe 1909-1939 and of Sigmund Freud: Briefe 1873-1939. He served as Managing Director of Sigmund Freud Copyrights Limited.