The Emperor of Japan is the monarch and the head of the Imperial Family of Japan. Under the Constitution of Japan, he is defined as the symbol of the Japanese state and the unity of the Japanese people, and his position is derived from "the will of the people with whom resides sovereign power".
It would be a "strike" that is the term utilized when union workers refuse to work due to contractual disagreements, although this can occur even when contractual issues are not present.