A documentary about the history of South Africa v New Zealand international rugby matches and how apartheid affected this.
To give a bit of background to this and a more global perspective, sport played quite a big role in the anti-apartheid movement. In the UK, cricket and rugby tours by South African teams had mass protests directed at them and (as you see the in documentary) this happened in NZ too.
Many countries boycotted sporting relations with South Africa, with them being banned from participating in the Olympics in 1962 and and the 1976 NZ rugby tour of South Africa caused 28 African countries to boycott the Montreal Olympics after the IOC refused to ban NZ from the Olympics.
There were a handful of players who went against the general pro-establishment ethos of rugby union and did not participate in tours of South Africa. Some of the NZ players are mentioned in the documentary but one notable British Lions player that boycotted a tour was John Taylor (for those who don't know, Lions tours are something that happen only once every 4 years and are a massive part of the rugby union tradition). This caused Brigadier Glyn Hughes (a rugby enthusiast but like many a complete cunt) to comment "He's not playing. The man's a Communist!"