Daniel Franks Margolies, 89, who joined the State Department in 1946 and retired in 1970 as a foreign policy adviser on the president's science advisory committee, died of pneumonia and renal failure Nov. 6 at a hospital in Aurora, Colo. He lived in Aurora.

Mr. Margolies, who received a State Department Superior Honor Award in 1969, was a target of Sen. Joseph R. McCarthy's loyalty investigations in 1951. The case went nowhere.

At the time, Mr. Margolies was an economist in the bureau of German affairs. He told the Associated Press in 1951, "The department went through the security process in hiring me and cleared me, and there is nothing in my background which is incompatible with loyal service to my government."

Mr. Margolies, a lawyer by training who was fluent in German, was a researcher and translator during the Nuremberg trials of Nazi leaders after World War II.

He was born in Cleveland and was a 1931 classical philology graduate of Harvard University and a 1936 graduate of its law school.

After that, he joined the Civil Liberties Committee of Sen. Robert M. La Follette Jr., a Republican from Wisconsin, to investigate practices meant to discourage labor organizing.

During World War II, he was with the Army in Europe and served in the Office of Strategic Services as a liaison to labor groups in Europe. He also worked with the Office of Price Administration and the Office of Economic Warfare.

While at the State Department in the 1950s, he was an economic counsel at the U.S. embassies in England and the Congo. With the science advisory committee in the mid-1960s, he helped raise money for the Korean Institute of Science and Technology to lure Korean scientists from abroad back to their native country.

Mr. Margolies, who lived in Washington for 50 years before moving to Colorado in 1996, was a member of the American Association of Public Policy. His hobbies included bridge and jigsaw puzzles.

His wife of 41 years, Harriet Zetterberg, died in 1986. Survivors include his daughter, Mary Margolies DeForest of Denver; and a son, David Margolies of Oakland, Calif.