Imre Lichtenfeld (also known as Imi Sde-Or) was born in 1910 in Budapest, Hungary and grew up in Bratislava (Slovakia). Lichtenfeld became active in a wide range of sports, including
gymnastics, wrestling, and boxing. In 1928, Lichtenfeld won the Slovakian Youth Wrestling Championship, and in 1929 the adult championship (light and middle weight divisions). That
same year, he also won the national boxing championship and an international gymnastics championship. During the ensuing decade, Imi's athletic activities focused mainly on wrestling,
both as a contestant and a trainer.
In the mid-1930s, anti-Semitic riots began to threaten the Jews of Bratislava, Czechoslovakia. (The country was created from parts of Austro-Hungary in 1918—a result of World War l) Lichtenfeld became the leader of a group of Jewish boxers and wrestlers who took to the streets to defend Jewish neighborhoods against the growing numbers of national socialist party and anti-Semitic thugs. Lichtenfeld quickly discovered, however, that actual fighting was very different from competition fighting, and although boxing and wrestling were good sports, they were not always practical for the aggressive and brutal nature of street combat.
(source citation en.wikipedia.org )