Rosa Parks first met Dr. Martin Luther King Jr. in August 1955, when he was the guest speaker at the National Association for the Advancement of Colored People, or NAACP, and she was the secretary. Parks is best known for refusing to give up her seat to a white bus passenger on December 1, 1955, which began efforts to end segregation across the country. She is called the "Mother of the Civil Rights Movement."
Parks boarded the Cleveland Avenue bus after finishing her job at a department store. She took one of the seats that had been set aside for non-white passengers. When she refused to give up her seat to a white passenger, she was arrested. She was found guilty of violating a civil ordinance. Her refusal to stand began the Montgomery Bus Boycott led by King, who believed her actions would help bring about change.