In 1979, Fuster was named Deputy Assistant
Attorney General of the
United States. He held that position until 1981. In 1984, he was elected
Resident Commissioner of Puerto Rico to the
United States Congress. During his tenure (1985–1992), he served a term as Chair of
Congressional Hispanic Caucus. In both terms, he served on the Committee on Banking, Finance, and Urban Affairs, and on the Committee on Interior and Insular Affairs. In Congress, he was a strong advocate for educational and youth programs. He supported numerous laws and bills to give state and local governments assistance for youth service projects and programs aimed at preventing substance use. He also supported the establishment of a Children, Youth, and Families Administration, as well as the establishment of a federal child care program. He sponsored legislation to increase social security funds for families with blind, aged, and disabled dependents. In 1992, Governor
Rafael Hernández Colón appointed him to the
Supreme Court of Puerto Rico. Fuster resigned from his Resident Commissioner position on March 4, 1992 to take an appointment as associate justice of the Supreme Court of Puerto Rico. He took the oath of office on March 4, 1992 after confirmation by the Senate, serving on the Court until his death. Fuster was affiliated with the
Popular Democratic Party of Puerto Rico and the
Democratic Party of the
United States. ==Death==