Nikifor Grigoriev (Russian: Николай Алекса́ндрович Григо́рьев; c. 1885 – July 27, 1919), born Nychypir Servetnyk (Ukrainian: Ничипір Серветник) in a small village of Zastavlia (now in the Nova Ushytsia Raion, Ukraine), was a paramilitary leader noted for numerous switching of sides and anti-Semitism. He was commonly known as "Otaman Grigoriev", as "Matviy Hryhoriyiv", "Matvey Grigoriev", or "Mykola Grigoriev".
He is sometimes misrepresented as the Otaman of the "Green Army". His association with the Green Army became a sort of misnomer due to collaboration with the army of Otaman Zeleny (stands for Green in Russian and Ukrainian) which led a major movement on all fronts against Directoria, Bolsheviks, and Denikin's Army. Although he cooperated with Zeleny those collaborations were marginal and Grigoryev was later ousted by the leader of the Green Army.
Read more about Nikifor Grigoriev: Biography, Revolutionary Period, Allying With Bolsheviks, Grigoriev and Makhno, Awards