http://www.espn.com/blog/onenacion/p...ntes-number-21
throughout Clemente’s 17-year career (which began eight years after Robinson's), this proud black Puerto Rican dealt with racial, cultural and language issues head-on, even when he was mocked by sportswriters for his accent or when he couldn’t even stay with his white Pirates teammates in the segregated South.
Something as simple as a baseball card labeled “Bob Clemente” became the symbol of the cultural arrogance Roberto Clemente experienced daily.