Killing in the Name was Christmas Number 1 in 2009, it was a protest against X Factor domination. That was before streaming counted towards the charts, but it really made the song huge.
It was a great upset. And then for #1 spot on the UK Christmas charts, BBC invited RATM to play the song live. They were asked to keep it censored, of course they did not. Show was awkwardly cut short. Performance went viral. The rest is history.