Summary from Wikipedia

Papp was an Olympic gold medalist three times,[1] at middleweight in London in 1948, then as a light middleweight in Helsinki in 1952 and in Melbourne in 1956. Papp also was the European amateur middleweight champion as a middleweight in 1949 at Oslo and at light middleweight at Milan in 1951. He scored 55 first-round knockouts as an amateur, his record was 301-12-6.