Communist revolution (its first insurrectional triumphs inevitably taking place in certain parts of the world) is necessarily worldwide: either it spreads or it dies!
The proletariat cannot reach its objectives at any other level, whether at that of the factory, the region, the country or even a group of countries. No kind of what is historically termed "workers' control", "self-managed production" of one or all the companies in a country leads to the destruction of the capitalist production relationship nor is it, in any way, the path towards this destruction. Communism, as a movement, opposes and excludes, at its origin, homeland, nation and national struggle. The abolition of all borders and nations is inherent in its development.
The constitution of the proletariat into a single body acting on a worldwide level implies organic centralism. Organic centralism guarantees the general interests of the movement against all particularism, localism, immediatism and it also struggles against corporatist, federalist and self-managementist ideologies which are only of benefit to the counter-revolution. This is obviously the case for all class organisations - associations, formal parties, state... - and during all phases of the struggle, whether the proletariat is a dominated or dominating class.