Harriet Tubman: Visions of Freedom premieres October 4, and Becoming Frederick Douglass premieres October 11 on PBS and stream on the PBS Video App and PBS.org OWINGS MILLS, MD, Sept. 29, 2022 (GLOBE NEWSWIRE) -- Two original documentaries that shed new light on the lives of a pair of towering figures in the struggle to end slavery – Harriet Tubman and...