There are species of ants that enslave other ants.
Quite a few ant species take captives from other ant species, forcing them to do chores for their own colony. Honeypot ants even enslave ants of the same species, taking individuals from foreign colonies to do their bidding. Polyergus queens, also known as Amazon ants, raid the colonies of unsuspecting Formica ants. The Amazon queen finds and kills the Formica queen, then enslaves the Formica workers. The enslaved workers help the usurping queen rear her own brood. When her Polyergus offspring reach adulthood, their sole purpose is to raid other Formica colonies and bring back their pupae, ensuring a steady supply of enslaved workers.