From the mid-18th century, new machines powered by steam and coal began to produce goods on a massive scale. This was known as the Industrial Revolution. Workers were poorly paid and their working conditions were harsh. Life was even harder for working women, who received lower wages and fewer rights than men. Some women, however, would not stand for the poor treatment of themselves or others. These are the stories of four trailblazers who achieved amazing things in difficult circumstances: Known as the "Angel of the Prisons," Elizabeth Fry brought about changes for female and child inmates. Florence Nightingale did the unthinkable for a woman of the time and, instead of getting married, became a nurse and reformed the nursing system. Sarah G. Bagley was a pioneering labor activist who fought against harsh factory conditions. "Mother" Jones earned the title of "most dangerous woman in America" by traveling around the country urging coal miners and mill workers to stand up for their rights. Many of the rights women have today are thanks to their actions. They helped change society's image of women forever.