Communist
The Spanish word 'comunista' translates to 'communist' in English. A communist is a person who supports or believes in the principles of communism. Communism is a socioeconomic system where all property is publicly owned and each person works and is paid according to their abilities and needs. The term 'comunista' is used in many of the same contexts in Spanish that 'communist' would be used in English.
He is not a communist.
This sentence is used to deny the affiliation of someone to the communist ideology.
My neighbor says he is a communist.
This sentence expresses the way in which someone's political orientation is understood or conceived by others, based on what they themselves have declared.
Are you a communist?
This sentence is used to inquire about someone's political ideology, expressing curiosity or seeking clarification.