In Marxist philosophy, the dictatorship of the proletariat is a condition in which the proletariat, or working class, holds control over state power. The dictatorship of the proletariat is the transitional phase from a capitalist and a communist economy, whereby the post-revolutionary state seizes the means of production, mandates the implementation of direct elections on behalf of and within the confines of the ruling proletarian state party, and institutes elected delegates into representative workers' councils that nationalise ownership of the means of production from private to collective ownership. During this phase, the administrative organizational structure of the party is to be largely determined by the need for it to govern firmly and wield state power to prevent counterrevolution, and to facilitate the transition to a lasting communist society.

A socialist state, socialist republic, or socialist country, sometimes referred to as a workers' state or workers' republic, is a sovereign state constitutionally dedicated to the establishment of socialism. The term communist state is often used synonymously in the West, specifically when referring to one-party socialist states governed by Marxist–Leninist communist parties, despite these countries being officially socialist states in the process of building socialism and progressing toward a communist society. These countries never describe themselves as communist nor as having implemented a communist society. Additionally, a number of countries that are multi-party capitalist states make references to socialism in their constitutions, in most cases alluding to the building of a socialist society, naming socialism, claiming to be a socialist state, or including the term people's republic or socialist republic in their country's full name, although this does not necessarily reflect the structure and development paths of these countries' political and economic systems. Currently, these countries include Algeria, Bangladesh, Guyana, India, Nepal, Nicaragua, Sri Lanka and Tanzania.