socialist

adjective1

1. •
   Of, relating to, supporting, or advocating socialism.

   • […]it must be remembered that in a Socialist farm or manufactory, each labourer would be under the eye not of one master, but of the whole community. — 1848

noun1

1. •
   One who supports or advocates socialism.

   • A contest, who can do most for the common good, is not the kind of competition which Socialists repudiate. — 1848

adjective1

1. •
   Of, belonging to, or constituting a party or political group that advocates socialism.

   • An intelligent Socialist movement will use their patriotism, instead of merely insulting it, as hitherto. — 1941

noun1

1. •
   A member of a party or political group that advocates socialism.