As president, she began to study the issue of bus segregation, which affected the many blacks who were the majority of riders on the city system.

Other women were also arrested for resisting bus segregation.

A three-judge panel ruled on June 13, 1956, that bus segregation was unconstitutional, and the case went to the US Supreme Court.

By then, the US Supreme Court ruled in Browder v. Gayle that bus segregation was unconstitutional.

Parks was not the first person to resist bus segregation.

In June 1956, Judge Frank M. Johnson ruled that Montgomery's bus segregation was illegal.

In 1955, she was the first person arrested for resisting bus segregation in Montgomery, Alabama, preceding the better known Rosa Parks incident by nine months.

On June 13, 1956, the judges determined that the state and local laws requiring bus segregation in Alabama were unconstitutional.

Three days later, the Supreme Court issued an order to Montgomery and the state to end bus segregation in Alabama.

Eventually a ruling by the United States Supreme Court in the case declared bus segregation unconstitutional.