Crossbones (character)

Crossbones (Brock Rumlow) is a fictional supervillain appearing in American comic books published by Marvel Comics. The character is usually depicted as an adversary of Captain America, and played a part in his assassination.

The character has been adapted into multiple forms of media, most notably being portrayed by Frank Grillo in the Marvel Cinematic Universe films Captain America: The Winter Soldier (2014), Captain America: Civil War (2016), and Avengers: Endgame (2019).

Fictional character biography
Brock Rumlow led the Savage Crims gang on New York City's Lower East Side, during which time, he assaulted fifteen-year-old Rachel Leighton and fought Rachel's two brothers, killing the elder brother. Rumlow fled, entering Taskmaster's school for criminals, within three years becoming an instructor under the name Bingo Brock.