Who determins the 'genre' tags (located top of the page, next to run time) for a film on the IMDb site?

I'm asking because a lot are wrong ie: Gandhi is labelled as - Biography, Drama, History which is correct (although I would personally swap History with Drama so it is second. Am I being too pedantic?)

However, The Untouchables is labelled as Crime, Drama, History - History should not come anywhere near this film as it isn't even 'dramatised' just plain fabricated.