Rule of law

Has anybody considered what a dangerous concept this is, given that laws are not only man-made but can be changed in a matter of seconds? Sen. Cruz tried it on the floor of the Senate recently and was only deterred by another Senator objecting. Who crafted those ridiculous internal operational rules? Never mind that slavery was/is entirely legal.

How do we define slavery? Is it involuntary servitude (labor) or a person being owned?