Well for one, the 13th amendment to the constitution of the US which abolished slavery - did not abolish slavery for those convicted of a crime.
“I am for socialism, disarmament, and, ultimately, for abolishing the state itself... I seek the social ownership of property, the abolition of the propertied class, and the sole control of those who produce wealth. Communism is the goal.”
“Inanimate objects can be classified scientifically into three major categories; those that don't work, those that break down and those that get lost.”