Ejército Negro
Simon Mikytovich Karetnik (; 1893 – November 26, 1920) was a Ukrainian anarchist and a commander of the Revolutionary Insurrectionary Army of Ukraine (RIAU). He often replaced Nestor Makhno as supreme commander of the Black Army in 1920. Karetnik gained a reputation for his central role in defeating the White Army in Crimea in November 1920.