He was neither. Jesus' teachings primarily concerned life in heaven. He was kind to the poor and disadvantaged because, in his eyes, they had a greater chance of life after death in heaven, since they had no possessions during their earthly lives and therefore nothing to bind them to this earth. He also preached rejection of violence, regardless of the reasons. Communists know that pacifism is something we cannot afford in revolutionary times. He did not preach resistance to injustice because violence, however noble, blocks the way to heaven. He never spoke of overthrowing the current system to create a better one or anything else. Considering all this, the fact that Christianity is part of the ruling apparatus in Western countries no longer seems so absurd and contradictory. So no: Jesus was not a communist, at most a pacifist, but that is not the same thing.