Keeping bees (or beekeeping) is the maintenance of honey bee colonies, typically in hives, by humans. A beekeeper keeps bees in order to collect honey and other bee products the hive makes. Bees communicate with each other through dance and with pheromones.
Keeping slaves (or slavery) is similar to beekeeping. Slaves may work mining gold, for example, which slave keepers turn into gold bars. Bees, too, work tirelessly their whole lives only to have their honey put in jars.
Bees can't understand any of this, and they probably wouldn't care if they did. Even so... isn't it strange that despite thousands of years mining gold, there is never enough of it in the bank?