The Kienthal Conference (also known as the Second Zimmerwald Conference) was held, in the Swiss village of Kienthal, between April 24 and 30, 1916. Like its 1915 predecessor, the Zimmerwald Conference, it was an international conference of socialists who opposed the First World War.
The conference had been called by an Enlarged Session of the International Socialist Commission (ISC) in February 1916. The reasons for a second conference included the opposition that the International Socialist Bureau was putting up against the Zimmerwald movement, the opposition of the bourgeois nationalists and the "gradually maturing plans for peace".
The following delegates participated in the conference:
A number of delegates named by groups in Great Britain, the Netherlands, Austria, Bulgaria, Romania, Sweden, Norway and by the General Jewish Labour Bund in Lithuania, Poland and Russia were unable to attend. Additionally, the Revolutionary Socialist League of the Netherlands had transferred its mandate to Radek and the Social-Democracy of the Lettish Territory had transferred its mandate to Zinoviev. A Lithuanian group around the magazine Social-Democratas in London tried to affiliate with the Zimmerwald Left and authorized Jan Berzin to sign a draft manifesto of left wing delegates for them, but he had already transferred his mandate to Zinoviev and their vote was "lost". A member of the Independent Labour Party was present as a "guest".
The delegates met at the small Swiss village of Kienthal at the foot of the Blüemlisalp from April 24 to 30, 1916. Portuguese delegate Edmondo Peluso gave a very detailed account: