Socialist vs left wing

Socialist

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

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

left wing

noun
  • The left-hand side of a sports field. 

  • The more left-wing faction of a group or party. 

  • The offensive player who plays to the center's left. 

How often have the words Socialist and left wing occurred in a corpus of books? (source: Google Ngram Viewer )