The American Left consists of individuals and groups that have sought egalitarian changes in the economic, political and cultural institutions of the United States. Various subgroups with a national scope are active. Liberals and progressives believe that equality can be accommodated into existing capitalist structures, but they differ in their criticism of capitalism and on the extent of reform and the welfare state. Anarchists, communists, and socialists with international imperatives are also present within this macro-movement. Many communes and egalitarian communities have existed in the United States as a sub-category of the broader intentional community movement, some of which were based on utopian socialist ideals. The left has been involved in both Democratic and Republican parties