hard left

Short definition from Wiktionary

Noun

1. 1
   The section of the left wing that supports traditional socialist policies, distinguished from the social democratic centre-left and the communist and anarchist far left.
2. 2
   Synonym of far left.
3. 3
   Used other than figuratively or idiomatically: see hard, left.

Adjective

1. 1
   Alternative form of hard-left.
2. 2
   Synonym of far-left.