There is no time frame on your question, so there are any number of answers that can help you. The women's rights movement started way back in 1848 at the Seneca Falls Convention in New York. Leaders like Susan B. Anthony and Elizabeth Cady Stanton organized a movement, issued a declaration, and then went state to state to recruit converts to the cause, and to break the laws by actually voting. Later suffragists included Lucretia Mott and Carrie Chapman Catt.
In the 1920s Margaret Sanger advocated legal birth control so that women would have more options in planning their families.
The modern women's movement starts in the late 1960s with the publication of The Feminine Mystique by Betty Friedan. She organized the NOW, the National Organization for Women, and with help from the movement led protest marches and pushed for an Equal Rights Amendment (which failed to be adopted by only one state - it needed 38, got 37).