Fuld's specialty was developing new theories to prosecute racketeers, including Charles "Lucky" Luciano and James J. Hines, the Tammany Hall district leader.
In November 1937, Dewey was elected District Attorney of New York County, and appointed Fuld Head of the Indictment Bureau.
Afterwards he resumed his private practice On April 25, 1946, Fuld was appointed by Dewey, now Governor, a judge of the New York Court of Appeals to fill the vacancy caused by the death of George Z. Medalie.
In that capacity, after the Attica Prison riot was brutally suppressed in 1971, Governor Nelson Rockefeller invited him and four other state judges to appoint a citizens' committee to investigate the entire affair.
[1] He retired from the bench at the end of 1973 when he reached the constitutional age limit of 70 years, and returned to private practice.