Leninism
Vanguard party
The Communists, therefore, are, on the one hand, practically the most advanced and resolute section of the working-class parties of every country, that section which pushes forward all others; on the other hand, theoretically, they have over the great mass of the proletariat the advantage of clearly understanding the lines of march, the conditions, and the ultimate general results of the proletarian movement. The immediate aim of the Communists is the same as that of all other proletarian parties: Formation of the proletariat into a class, overthrow of the bourgeois supremacy, conquest of political power by the proletariat.
Dictatorship of the proletariat
the organisation of the vanguard of the oppressed as the ruling class for the purpose of crushing the oppressors. ... An immense expansion of democracy, which, for the first time, becomes democracy for the poor, democracy for the people, and not democracy for the rich ... and suppression by force, i.e. exclusion from democracy, for the exploiters and oppressors of the people—this is the change which democracy undergoes during the 'transition' from capitalism to communism.
National self-determination
We fight against the privileges and violence of the oppressor nation, and do not in any way condone strivings for privileges on the part of the oppressed nation. :... The bourgeois nationalism of any oppressed nation has a general democratic content that is directed against oppression, and it is this content that we unconditionally support. At the same time, we strictly distinguish it from the tendency towards national exclusiveness. ... Can a nation be free if it oppresses other nations? It cannot.