Secrets of Wwii: Black GIS in Britain, presenter Nadifa Mohamed reveals Winston Churchill's controversial decision to allow America's segregated army into the U.K. during World War II, bringing in 15,000 Black troops who endured discrimination and hostility from white GIs. The film explores the resulting tensions that arose, the violent clashes that broke out like the "Battle of Bamber Bridge," the British support of the Black troops, and the lasting impact of this wartime racism.