Mulzac was born in Baltimore, daughter to Hugh Mulzac, a socialist and the first black commander of a ship in the United States merchant marine. She grew up in Bedford Stuyvesant, where she graduated from Girls High School.
In 1963, Mulzac moved to British Guiana; after fighting for revolution, she was injured in a bomb attack.
Her grand nephew is Sharrif Simmons, a poet and songwriter.
- Sharifa Rhodes-Pitts, Harlem Is Nowhere: A Journey to the Mecca of Black America, Little Brown, 2011, ISBN 978-0-316-01723-7
- Douglas Martin, "Una Mulzac, Bookseller With Passion for Black Politics, Dies at 88", New York Times, Feb. 5, 2012.
- The Crisis. Mar 1958. Retrieved February 5, 2012.
- "interview". WBHM.
- Slutsky, Irina. "Barnes & Noble Says No to Harlem USA". Columbia. Retrieved February 5, 2012.
- Douglas, Laura (October–November 2000). "Save Harlem's Liberation Bookstore!". The Multiracial Activist. Retrieved February 5, 2012.
- Jacob McKean, "Last Chapter Draws Near at Mainstay Harlem Bookstore", Columbia Spectator, October 31, 2003.
- "Liberation Bookstore Inventory for Purchase -- Immediate Response Appreciated". Now Rise Books. August 9, 2010. Retrieved February 5, 2012.