If you liked Cry Freedom...
I also recommend director John Boorman's "In My Country" (2004) (aka "Country of My Skull"). It shows us the workings of the Truth and Reconcialtion Commission of post-apartheid South Africa, and it some ways I found it more intense and personal than "Cry Freedom". I thought the love story was superfluous, but the testimony of the witnesses was gut-wrenching.
Having seen "Cry Freedom" only a couple of weeks after "In My Country", I felt I had more of a context in which to understand just how dangerous it was to live in South Africa at the time--not just for activists such as Biko, but for anyone who didn't want to close their eyes to the abuse and indignities suffered by every black person every day of their lives. Both movies did an excellent job of showing how apartheid dehumanized both its victims and its perpetrators.