www.yivoencyclopedia.org/article.aspx/Moscow
...Jews played an active role in the revolutionary events of 1917, and were represented in diverse political camps.
Among those defending the [anti-Bolshevik] provisional government were the Socialist Revolutionary Osip Minor, who was chairman of the Moscow City Duma, and the Menshevik Grigorii Kipen, who served as first deputy chairman of the Moscow City Soviet.
Hundreds of Jewish military cadets fought against Bolshevik soldiers in October 1917, and Jews also played an active role within the Bolshevik camp...