By Mfuneko Toyana PRETORIA (Reuters) - South Africa delayed a politically sensitive decision on whether to grant parole to apartheid death-squad leader Eugene de Kock, dubbed 'Prime Evil' for torturing and murdering black activists in the 1980s and early 1990s. Justice Minister Michael Masutha told reporters on Thursday de Kock had "made progress" towards rehabilitation after 20 years behind bars but said the families of his victims had not been properly consulted. De Kock lawyer Julian Knight dismissed the delay as "political interference" and said he would challenge Masutha's interpretation of the law on consulting victims' families in parole matters. "We're not going to roll over and play dead." De Kock himself was "disappointed", he added.