If you are living out of a sense of obligation you are slave.
Who Rebels? Who rises in arms? Rarely the slave, but almost always the oppressor turned slave.
The Soviet Union used the exploitation of workers under capitalism as an agitational issue to subvert Western democracies even as it practiced slave labor at home.
The man who has no inner-life is a slave to his surroundings.
A society without democracy is a society of slaves and fools.