Donald M. Fraser, a former Minnesota congressman whose hearings exposed a conspiracy by South Korean intelligence officials and the Rev. Sun Myung Moon in the 1970s to buy political influence in America and manipulate United States foreign policies and currency laws, died on Sunday at his home in Minneapolis. He was 95.

A spokesman for Mayor Jacob Frey of Minneapolis confirmed the death.

A liberal Democrat and protégé of Hubert H. Humphrey, the former Minnesota senator and vice president under Lyndon B. Johnson, Mr. Fraser served eight terms in the House of Representatives, from 1963 to 1979. Like Humphrey, he also served as mayor of Minneapolis, in his case for a record four terms.

In the House, he established a strong record on human rights, foreign aid and environmental conservation. (He was an avid canoeist into his 80s, frequenting the Boundary Waters area of northeast Minnesota.) He was also one of the nation’s most outspoken opponents of American involvement in the Vietnam War.

But he was best known as chairman of a panel whose hearings in 1977 and 1978 concluded that the Korean Central Intelligence Agency and Mr. Moon — the Korean businessman, self-proclaimed messiah and founder of the Unification Church — had conspired to bribe American officials to influence national policies and illegally raise and move millions of dollars across international borders.