Merdeka, 25 April 1951 (hlm. 2): plans for May Day 1951 by a central committee (SOBSI, KABM) assisted by the Peace Defence Committee, Lekra, Pemuda Rakyat, Sakti and Gerwis, framed as defence of world peace.
Full-page notice in the Surakarta magazine Bentara listing the organising committee of the 1 May 1951 Labour Day commemoration, a left united front dominated by SOBSI unions and including Gerwis.
Nieuwe Courant, 11 May 1951: the editor of the daily Massa was summoned by the military police over an article by S.K. Trimurti on the 1 May celebration, said to insult Sukarno. Quoted passages mock Sukarno's May Day promises, 'we are used to that from brother Soekarno since the Japanese time'. Editor Soemaritoro accep