I don't get why some people here are saying she was pro-apartheid. Yes, she thought sanctions against South Africa would not have the desired effect or even be counter-productive, but that is not the same as being pro-apartheid. I wonder if any the people demonizing her on that point are intellectually honest enough to be pro-sanctions on Cuba. After all, if sanctioning repressive regimes is the only good thing to do, Cuba should be subject to heavy sanctions.
Calling Mandela a terrorist implies she wasn't completely on board with the anti-apartheid agenda and was only concerned about efficacy.
It's simply because Mandela didn't renounce to armed struggle till the late 80s.