The books on this list are collections of biographies of social justice activists. There are also many excellent biographies of social justice activists for elementary and middle school, however we do not have a list for those yet. An online source we recommend is Americans Who Tell the Truth. (Note that while the books below are excellent collections, we don't agree that every profile fits the description of a social justice changemaker.)
101 Changemakers: Rebels and Radicals Who Changed US History
By Michele Bollinger (Editor), Dao X. Tran (Editor)
The Black Panthers: Portraits from an Unfinished Revolution
By Bryan Shih, Yohuru Williams, Peniel E. Joseph (Introduction by)
Heroes of the Environment: True Stories of People Who Are Helping to Protect Our Planet
By Harriet Rohmer, Julie McLaughlin (Illustrator)
Lighting the Fires of Freedom: African American Women in the Civil Rights Movement
By Janet Dewart Bell
No Voice Too Small: Fourteen Young Americans Making History *
Edited by Lindsay H. Metcalf, Keila V. Dawson, and Jeanette Bradley
#NotYourPrincess: Voices of Native American Women*
Edited by Lisa Charleyboy and Mary Beth Leatherdale
Rad American Women A-Z: Rebels, Trailblazers, and Visionaries Who Shaped Our History . . . and Our Future!*
By Kate Schatz, Miriam Klein Stahl (Illustrator)
Rad Girls Can: Stories of Bold, Brave, and Brilliant Young Women
By Kate Schatz, Miriam Klein Stahl (Illustrator)
Rad Women Worldwide: Artists and Athletes, Pirates and Punks, and Other Revolutionaries Who Shaped History
By Kate Schatz, Miriam Klein Stahl (Illustrator)
Teenage Rebels: Stories of Successful High School Activists, from the Little Rock 9 to the Class of Tomorrow
By Dawson Barrett, Mark Rudd (Foreword by)