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Socialism has been mentioned in several liberal democratic constitutions. It is referenced either in the form of denunciation (as is the case in the Croatian, Hungarian and Polish constitutions) or in form of construction, namely that the constitution of the state in question proclaim that it seeks to establish a socialist society (Bangladesh, India, Guyana and Portugal being examples). In these cases, the intended meaning of the term socialism can vary widely and sometimes the constitutional references to socialism are left over from a previous period in the country's history.
With the exceptions of Bangladesh, India, Guyana, Portugal, and Sri Lanka, references to socialism were introduced by Marxist–Leninist communist parties (sometimes in collaboration with more moderate socialist parties). In India, it is used in relation to secularism. In Sri Lanka, socialist terms were introduced by the United National Party. Tanzania considers itself to be a socialist state, having previously been a one-party state led by the Party of the Revolution (which has been in power since independence). Croatia, Hungary and Poland have references to socialism in the form of rejection of their own past communist state.
Countries governed by a single Marxist–Leninist party that have made an attempt to abolish capitalism and/or aim to implement socialism are socialist countries that are referred to as communist states. Some of these socialist states use the title of people's republic. A number of republics with liberal democratic political systems such as Algeria and Bangladesh also adopted the title.