In 1998, a brutal and controversial indie film portrayed a grim vision of white nationalism in the US. Twenty-five years on, did it anticipate a growing, 21st-Century movement, writes Tom Joudrey.

The black headteacher, Dr Sweeney (Avery Brooks), gives Danny an ultimatum: study under his wing in an ad hoc course called "American History X," or face expulsion. Danny's assignment is to ...