Louis 'Sonny' Marciano, younger brother of Rocky Mariano, the only undefeated heavyweight champion of the world, died Monday.

Boxing has long been intertwined with the American labor movement, serving as a powerful symbol of the working class. From ...

Rocky Marciano had two goals in mind while growing ... The odds of Marciano succeeding in boxing seemed about the same as him reaching the major leagues. He was a crude, barroom-brawler type.

Became the youngest heavyweight champion in boxing history at the age of 20. Earned an estimated $400 million in career ring ...