The 100 Greatest Americans of the 20th Century: A Social Justice Hall of Fame

A hundred years ago, any soapbox orator who called for women's suffrage, laws protecting the environment, an end to lynching, or a federal minimum wage was considered a utopian dreamer or a dangerous socialist. Now we take these ideas for granted — because the radical ideas of one generation are often the common sense of the next. We all stand on the shoulders of earlier generations of radicals and reformers who challenged the status quo of their day.

Unfortunately, most Americans know litt...