1. 社会主义的
    Socialist means based on socialism or relating to socialism.

    e.g. ...members of the ruling Socialist party...
           执政的社会主义党党员
    e.g. ...low-inflation policies practised by the socialist government...
           社会主义政府执行的低通货膨胀政策

2. 社会主义者;社会主义党人
    A socialist is a person who believes in socialism or who is a member of a socialist party.

    e.g. The French electorate voted out the socialists.
           法国大选中社会主义党人落选。