50 years ago, on March 7, 1965, a nonviolent protest about voting rights for African Americans turned tragic when police attacked demonstrators on what would come to be called “Bloody Sunday.”

Two days later, the Rev. Martin Luther King Jr. asked faith leaders to join him for a second march in support of equal rights for black voters. A young Methodist pastor in Boston heard his call and soon found himself in the middle of history. Like so many, the Rev. Gil Caldwell can never forget that event 50 years ago.

What do you choose to speak up for?