Each one, teach one. So goes the compact black prisoners made with each other during the swell of Apartheid in the 1960’s.  In a lime quarry on Robben Island, several miles off the coast of Cape Town, South Africa, Nelson Mandela and his fellow prisoners educated others under the brutal watch of white guards.

https://www.huffpost.com/entry/entering-prison-with-a-syllabus_b_8057558