What's the noun for enslavers? Here's the word you're looking for.
slave
A person who is the property of another person and whose labor and also whose life often is subject to the owner's volition.
A person who is legally obliged by prior contract (oral or written) to work for another, with contractually limited rights to bargain; an indentured servant.
One who has lost the power of resistance; one who surrenders to something.
“The abolitionists sent 5,000 petitions to Parliament with 1.5 million signatures calling for an end to slavery in the British colonies the following year.”
“The quotas were impossible to make, the work was sheer slavery, and conditions were deplorable.”
“The result is that the addict comes to believe in his or her own total and irreversible slavery to drugs.”
“The lower courts agreed but the Missouri Supreme Court sided with the slaveowner, prompting Scott to initiate a new lawsuit in federal court.”
“Replacing Jackson, a slaveowner, with the abolitionist Tubman would have a satisfying symmetry.”
“She had children with an Irish-American slaveowner named Shields whose family came from the rural area of Ballysheil in Co Offaly.”
slavocracy
(US, chiefly historical) The persons or interest representing slavery politically, or wielding political power for the preservation or advancement of slavery.