Apparatchik is a term that refers to a member of a large and powerful organization, typically one involved in politics. This term has its roots in the Soviet Union, where it was used to describe a bureaucrat or a member of the Communist Party. However, there are several synonyms for this term that you can use to add some variety to your writing. Some of the synonyms that you can use include functionary, operative, bureaucrat, official, insider, and servant. These words can help you to avoid using the same term over and over again, making your writing more interesting and engaging.