The 16th Man 30 for 30 documentary by ESPN.
Maybe the whole New Zealand Rioting in the 80's over the Springbok tour. It split the nation, half just wanted to watch and enjoy the rugby, the other half protested the games because RSA were in Apartheid at the time. This rioting inspired people over in RSA, I think theres a documentary on it on youtube (possible called A Political Game) it might be the right one anyway.
Have you watched the movie "Invictus" about the 1995 RWC in South Africa and how the game of rugby brought a disjointed nation together through Nelson Mandela and SA captain Pienarr ?
'The men that saved European ruby'