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John Groppo (August 14, 1921 – June 12, 2013) was an American mason contractor,
businessman, and politician.
Born in Winsted, Connecticut, Groppo served in the United States Marine Corps during World War II. He was a stonemason and was the owner of Leo Groppo & Son Mason Contractors. He served as mayor of Winsted, Connecticut 1965-1967. From 1959 to 1985 he served in the Connecticut House of Representatives as a Democrat and was majority leader. In 1985-1987, Groppo was commissioner of the Connecticut Department of Revenue Services. He died in Winsted, Connecticut.