| Term | Definition |
| Socialism | A leftist political ideology that emphasizes the principle of equality and usually prescribes a large role for government to intervene in society and the economy via taxation, regulation, redistribution and public ownership. |
| Utopian Socialism | Early 19th century socialism based on a universal appeal to reason |
| Proletariat | A Marxist term for those who sell their labour to the bourgeoisie = the working class. |
| Bourgeoisie | A Marxist term referring to those that own the means of production |
| Scientific Socialism | The term Marx and Engels used to stress to that their ideology was based on an analysis of class conflict |
| Dictatorship of the Proletariat | : A revolutionary seizure of power by the “vanguard” of society, the communist party, which then rules in the name of the working class. |
| First International | A loose association of socialist parties and labour unions in Western Europe, organized in 1864 |
| Anarchists | One who advocates anarchy (order resulting from mutual coordination in the absence of a higher authority) → followers of Mikhail Bakunin, who opposed Marx’s focus on the state/ |
| Second International | The organization socialists and labour parties in Europe, with the absence of a anarchists, established in 1889 |
| Democratic Centralism | The concentration of power in the leadership of the communist party, which in theory acts in the interest of the people |
| Third International | Worldwide association of communist parties, established in 1921 |
| Comitern | “Communist International”; also known as the Third International, the communist international organization between the two World Wars |
| Cominform | “Communist Information Bureau”. And international communist organization formed after World War II. |
| Social Democrats | Socialists emphasizing popular consent, peaceful change, political pluralism and constitutional government. |
| Mixed Economy | An economy based on both private and public (government controlled) enterprises |
| Planning | : Production and allocation of resources determined by a central authority |