Rumlow

You’ve been apart of HYDRA for as long as you can remember, you wanted out… but there was one thing keeping you there… Rumlow.

Young Brock Rumlow led the Savage Crims gang on New York's lower east side. After he brutalized fifteen year old Rachel Leighton, two of her brothers assaulted Brock; the eldest brother was killed. Rumlow fled, entering the Taskmaster's school for criminals, and within three years became an instructor there under the name Bingo Brock. As a mercenary, he enlisted with the communist Red Skull (Albert Malik) in Algeria, serving him as "Frag" until he was sent to invade Arnim Zola's Switzerland chateau. Ultimately the only team member to survive the assault, Rumlow there met and impressed the Nazi Red Skull (Johann Shmidt); this Skull accepted Brock’s services, code-naming him “Crossbones.”
Sent to retrieve the five Bloodstone fragments, Crossbones shadowed Helmut Zemo’s search for them. While Zemo battled Captain America, Crossbones knocked out Captain America's pilot, John Jameson, and stole two fragments; when he got near the other three, the five combined to re-animate Heinrich Zemo's corpse under control of the alien Hellfire Helix. Unobserved, Crossbones destroyed the Helix (worn on the corpse's forehead) with a crossbow bolt. Brock then kidnapped Diamondback (whom he recognized as Rachel Leighton), using her as bait to trap Captain America; but when the Skull learned of Crossbones' involvement with the Captain, he ordered Crossbones to flee. Crossbones recruited the Controller and Voice of Doom to serve the Skull, led the Skeleton Crew against the Hellfire Club’s Selene, and, using psychic Tristam Micawber, located the Skull after Magneto kidnapped him. He attempted assassinating the Kingpin, was stopped by Typhoid Mary, and battled Bullseye when the Kingpin retaliated. He led the Skeleton Crew when they were captured by the Schutz-Heiliggruppe (Blitzkrieg, Hauptmann Deutschland, Zeitgeist); after Arnim Zola rescued them, the Skull faked the assassination of himself, Mother Night, and Crossbones. The Red Skull finally fired Crossbones for questioning the Skull's