The practice of slavery has been a dark blot in human history. The people who were forced into servitude under a master's authority were often subjected to harsh treatment. An overseer was responsible for supervising slaves and ensuring they were productive. The term overseer slaves is a combination of two words that are synonymous with each other - overseer means supervisor, while a slave is a person who is held in servitude. Other terms that are interchangeable with this phrase include slave driver, taskmaster, and boss. These words are used to describe someone who has control over others and is responsible for ensuring they complete their assigned tasks.