since 1958, isnaeni was seated as the member of the central executive council of pni. on 29 june 1960, at the 9th congress of the indonesian national party in solo, isnaeni was re-chosen as the member of the central executive council of pni, and at the next congress of the party in solo on 1963, he was elected as the vice general secretary, with surachman seating the general secretary position. his disagreements with surachman made him fired from the party, along with 10 other figures from pni. these figures later formed the osa-usep faction of the party on october 1964, named after the chairman and general secretary of the faction, osa maliki and usep hadisubeno. the faction was strictly anti-communist, as opposed to the communist surachman. surachman later found to be an indonesian communist party cadre that entered pni to mess the party.