One who advocates or practices the doctrines of socialism.
a political advocate of socialism
of or relating to or promoting or practicing socialism; "socialist theory"; "socialist realism"; "asocialist party"
advocating or following the socialist principles; "socialistic government"
a theory that places the means of production and distribution in the hands of the community
an advocate of socialism, which is a theory of social organisation that advocates vesting of ownership of land and capital in the community as a whole