A feared death squad in Bourne Sanction.
This group is created by Soviet Muslims who repressed by Stalin. They defected secretly to Nazi Germany. With Nazi superior training, they became the feared--but secretest--Death Squad during World War II, more than Gestapo or SS.
Black Legion aimed for USSR's destruction. However, in the end of World War, they already prepared for Nazi's failure and set up new plan, so there's no trace for their affiliation with Nazi.
Sever family and Icoupov family are the patrons of Black Legion.