On December 1, 1955, in Montgomery, Parks refused to obey a public bus driver's orders to move to the back of the bus to make extra seats for whites. Rosa was tired of being treated as a second-class citizen and stood firmly. She was arrested, tried, and convicted for disorderly conduct and for violating a local ordinance.
The very next night, 50 leaders of the African-American community, headed by a relatively unknown minister (Martin Luther King, Jr.) gathered to discuss the proper actions to be taken after Mrs. Parks arrest. What ensued next was the Montgomery Bus Boycott. The entire black community boycotted public buses for 381 days. Dozens of public buses stood idle for months until the law legalizing segregation in public buses was lifted. This event helped spark many other protests against segregation. In helping in this boycott, Rosa Parks helped make her fellow Americans aware of the history of the civil rights struggle.
In 1956 Parks's case ultimately resulted in United States Supreme Court's ruling that segregated bus service was unconstitutional.
Afterwards, Parks became an icon of the civil rights movement. She moved to Detroit in the early 1960s and served on the staff of U. S. Representative John Conyers (D-Michigan) from 1965 until 1988. She continues to reside in Detroit.
http://en.wikipedia.org/wiki/Rosa_Parks