Wikipedia
Platformism is a tendency (or organized school of thought) within the anarchist movement. It stresses the need for tightly organized anarchist organizations that are able to influence working class and peasant movements.
"Platformist" groups reject the model of Leninist vanguardism. They aim, instead, to "make anarchist ideas the leading ideas within the class struggle". The four main principles by which an anarchist organisation should operate, according to Platformists, are ideological unity, tactical unity, collective responsibility, and federalism.
In general, platformist groups aim to win the widest possible influence for anarchist ideas and methods in the working class and peasantry—like especifismo groups, platformists orient towards the working class, rather than to the extreme the left. This usually entails a willingness to work in single-issue campaigns, trade unionism and community groups, and to fight for immediate reforms while linking this to a project of building popular consciousness and organisation. They therefore reject approaches that they believe will prevent this, such as insurrectionist anarchism, as well as "views that dismiss activity in the unions" or that dismiss anti-imperialist movements.
The name "Platformist" derives from the 1926 Organisational Platform of the General Union of Anarchists (Draft). This was published by the Group of Russian Anarchists Abroad, in their journal Dielo Truda ("Workers' Cause" in Russian).
The group, which consisted of exiled Russian anarchist veterans of the 1917 October Revolution (notably Nestor Makhno who played a leading role in the anarchist revolution in the Ukraine of 1918–1921), based the Platform on their experiences of the revolution, and the eventual victory of the Bolsheviks over the anarchists and other groups. The Platform attempted to address and explain the anarchist movement's failures during the Russian Revolution outside of the Ukraine.
The document drew both praise and criticism from anarchists worldwide and sparked a major debate within the anarchist movement.
Today "Platformism" is an important current in international anarchism. Around thirty platformist and especifista organisations are linked together in the Anarkismo.net project, including groups from Africa, Latin America, North America and Europe. At least in terms of the number of affiliated organisations (if not in actual membership in some countries), the Anarkismo network is larger than other anarchist international bodies, like the synthesist International of Anarchist Federations and the anarcho-syndicalist International Workers' Association. It is not, however, a formal "international" and has no intention of competing with these other formations.