For those who understand that a revolutionary, restrictive, centralized Vanguard is necessary, that Democracy is not a principle and is at best a means to an end, for those who freely admit they fight for Proletarian Dictatorship and not "Proletarian Democracy."
For those who realize that all systems are inherently "totalitarian" and thus it is a meaningless buzzword, such as "anti authoritarianism." For those who realize that the working class, and that the working class party, should exercise the maximum control over society during the Revolutionary Dictatorship of the Proletariat, purging any and all counter-revolutionary tendencies (tendency being used in the broadest sense of the word). For those who realize that the proletariat must be "authoritarian" towards the Bourgeoisie.
"The Left historically tried, without breaking from the principle of world centralised discipline, to give revolutionary battle – although defensive – while keeping the vanguard proletariat intact from any collusion with the middle classes, their parties and their doomed-to- defeat ideologies. Having even the historical chance of saving, if not the revolution, at least the core of its historical party, being missed, it has today begun all over again, in a torpid and indifferent objective situation, within a proletariat infected to the bone by petty-bourgeois democratism. But the dawning organism, by utilising the whole of the doctrinal and praxis-based tradition – as confirmed by the historical verification of timely expectations – puts it into effect also with its everyday action; it pursues the aim of re-establishing an always wider contact with the exploited masses, and it eliminates from its structure one of the starting errors of the Moscow International, by getting rid of democratic centralism and of any voting mechanism, as well as every last member eliminating from his ideology any concession to democratoid, pacifist, autonomist or libertarian trends."
http://www.marxists.org/archive/bordiga/works/1965/consider.htm
However organic centralism itself implies a lot more than mere rejection of Democratic centralism. It implies the necessity of the program, of the invariance of Marxism, criticism of form over content, dynamic view on class, an acknowledgement that the class must act as a single entity (organism if you will) acting in one harmonious good, not caring about being authoritarian etc. The necessity of the program implies the necessity of a totalitarian state aparatus that is animated by the party. The dynamic understanding of the class and of the invariant program itself shows the concepts of the historical and formal party, which itself informs our view on activism. Organicism itself acknowledges communism is the human community and of the destruction of politics. In addition this "organic centralism means purge dissent" is really just a strawman*. You can find this in Bordigas speech at the 6th comintern and in "communist organization and disclipline." The rome theses discusses the organic nature of the party yet the party was Democratic at the time. While today organic centralism denies voting mechanism, it did not always, it simply uses the form that, when taking into account the context of things as they are, allows the party to operate in a way that allows its organic unity to dominate. Not a Dictatorship of the base (democratism) nor of the center (stalinism - though this may be necessary for a temporary amount of time) but a dictatorship of the program, a harmony between top, middle, and bottom.
"If it is only a minority of the class that is actually acting as a class for itself then it is only this minority that can be supported by the communists."
This is a group for those who already identify as organic centralists.
If you would like to learn more about Organic Centralism and Revolutionary Totalitarianism, perhaps these are the places to look:
http://www.revleft.com/vb/group.php?groupid=970
http://revolutionarytotalitarians.wordpress.com/
*Lenin's formula "Freedom of Discussion, Unity of Action" (and his explanation of this formula) is correct, and one of the defining points on how "dissent" should be dealt with and how the dissenters interact with the rest of the party. The party is a voluntary organization, ideally one is free to leave and join at their own choosing, but sometimes it will be necessary to expel certain elements of the party, and it must be remembered the history of communism is the history of splits: our principles are defined by the communist movement and it would be the utmost error to opportunistly betray them (Engels and Lenin both spoke of this), communists must be intransigent.