The next day, Parks was tried on charges of disorderly conduct and violating a local ordinance. The trial lasted 30 minutes. After being found guilty and fined $10, plus $4 in court costs, Parks appealed her conviction and formally challenged the legality of racial segregation.
That Monday night, 50 leaders of the African-American community gathered to discuss actions to respond to Parks' arrest. Edgar Nixon, the president of the NAACP, said, "My God, look what segregation has put in my hands!" Parks was considered the ideal plaintiff for a test case against city and state segregation laws, as she was seen as a responsible, mature woman with a good reputation.
After the success of the one-day boycott, a group of 16 to 18 people gathered at the Mt. Zion AME Zion Church to discuss boycott strategies. At that time Parks was introduced but not asked to speak, despite a standing ovation and calls from the crowd for her to speak; when she asked if she should say something, the reply was, "Why, you've said enough." The group agreed that a new organization was needed to lead the boycott effort if it were to continue. Rev. Ralph Abernathy suggested the name "Montgomery Improvement Association" (MIA). The name was adopted, and the MIA was formed. Its members elected as their president Martin Luther King, Jr., a relative newcomer to Montgomery, who was a young and mostly unknown minister of the Dexter Avenue Baptist Church.