High Quality Content by WIKIPEDIA articles! Nikifor Grigoriev (c. 1885 – July 27, 1919) was born Nychypir Servetnyk 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".