What is Baseball Color line?

Color line was a segregated policy towards African-American during late 1800's. African Americans weren't allowed to play or were excluded to play from Organized Baseball Game. "any club including one or more colored persons" was banned in 1864 because of the National Association of Baseball Players. Baseball became more professional sport over the years. For a while, baseball players weren't no longer restricted until late 1880's. According to Suite101.com there was no records of African-American baseball players in the league due to the policy who were slowly getting excluded more and more over time.