https://www.jfklibrary.org/learn/about-jfk/jfk-in-history/civil-rights-movement this is from the JFK library talking about the African american struggles of voting in the 50’s as well as the personal endorsement from Martin Luther King jr after Kennedy called his wife Correta while he (King) was in jail.

http://archive.oah.org/special-issues/teaching/2008_12/article.pdf this is a pdf that speaks on JFK as well, it speaks on the Martin Luther king jr connection as well as how his brother Robert Kennedy helped to secure his release from prison