Full Idea
There is equality where all are slaves, as well as where all are free.
Gist of Idea
Slaves can be just as equal as free people
Source
Bertrand Russell (Authority and the Individual [1949], 4)
Book Reference
Russell,Bertrand: 'Authority and the Individual' [Unwin 1977], p.62
A Reaction
A nice observation, though a person is only a slave if someone controls them, so it is not strictly true.