Quite possible....I haven't seen reports of her political rivals being 'necklaced', however.....yet.
Profile of Winnie Mandela
http://news.bbc.co.uk/2/hi/special_report/1997/the_winnie_mandela_trial/33659.stm
" In 1986 she made a speech in which she talked about achieving liberation from apartheid by using "necklaces" - a reference to the brutal murder of suspected collaborators by putting tyres round their necks and setting them alight. "
Give ‘em time.