The year 2021 was the 4th year in the history of the Bare Knuckle Fighting Championship, a bare-knuckle fighting promotion based in Philadelphia. Bare Knuckle Fighting Championship in 2020 2021 in Bare Knuckle Fighting ChampionshipĢ020 in Bare Knuckle Fighting ChampionshipĢ021 in Bare Knuckle Fighting ChampionshipĢ022 in Bare Knuckle Fighting Championship
