Firefighters take part in a march to the National Civil Rights Museum on Thursday, April 4, 2013, in Memphis, Tenn. Labor groups marched to call for better conditions on the 45th annive

 

              Firefighters take part in a march to the National Civil Rights Museum on Thursday, April 4, 2013, in Memphis, Tenn. Labor groups marched to call for better conditions on the 45th annive
Firefighters take part in a march to the National Civil Rights Museum on Thursday, April 4, 2013, in Memphis, Tenn. Labor groups marched to call for better conditions on the 45th anniversary of the killing of Dr. Martin Luther King Jr. King was assassinated April 4, 1968, while he was in Memphis to support striking sanitation workers. (AP Photo/Mark Humphrey)