the Mezhraiontsy group was formed in November 1913. In early 1914, Plekhanov followed suit and formed his own group, Yedinstvo (Unity), with his old friends and followers Vera Zasulich and Leo Deutsch The group was founded abroad, but its supporters became active in Russia proper as early as the spring of 1914 and published 4 issues of the newspaper Yedinstvo in St. Petersburg in May and June 1914.
The Mezhraiontsy group was formed in November 1913. Plekhanov established his own group, Yedinstvo (Unity), with Vera Zasulich and Leo Deutsch in early 1914. The group's supporters became active in Russia by the spring of 1914, publishing four issues of their newspaper, Yedinstvo, in St. Petersburg during May and June 1914.