I haven't been keeping up on the Nelson Mandela story but this page from the website American Vision gives plenty of information about how the adulation of the man since his recent death is based on ignorance of what he really did.
He was imprisoned for
terrorist acts to which he pleaded guilty, acts that killed women and children, and terrible tortures. Few seem to know that. This page is mostly interviews with Peter Hammond, a South African missionary who protested Mandela's policies in office.