Alter-globalization is a social movement whose proponents support global cooperation and interaction, but oppose what they describe as the negative effects of economic globalization, considering it to often work to the detriment of, or to not adequately promote, human values such as environmental and climate protection, economic justice, labor protection, protection of indigenous cultures, peace and civil liberties. The movement is related to the global justice movement.

Proletarian internationalism, sometimes referred to as international socialism, is the perception of all proletarian revolutions as being part of a single global class struggle rather than separate localized events. It is based on the theory that capitalism is a world-system and therefore the working classes of all nations must act in concert if they are to replace it with communism.