communist

Of, relating to, supporting, or advocating communism.

An advocate of a society based on the common ownership of property; a proponent of communism.

Any revolutionary or subversive radical.

A member of a formally constituted Communist Party.

...all through the between-war years no Socialist programme that was both revolutionary and workable ever appeared; basically, no doubt, because no one genuinely wanted any major change to happen... The Communists wanted to go on and on, suffering a comfortable martyrdom, meeting with endless defeats and afterwards putting the blame on other people.

A proponent of the kind of communism formally espoused by such a party, typically either Marxism, or more commonly, Leninism or Maoism.

Any member of an organization, especially a military force, controlled and led by a formally constituted Communist Party, even if most individual members of the organization are not party members.

For example, what will happen if a landing is achieved and the Communists are advancing with some success?

Alternative letter-case form of communist, a proponent of the general philosophy of communism.