Other "Factions".

FAN(S) .

Indeed, I was thinking of football/football fans.
1) Leg -> football
2) This one is a bit tricky. It's the avatar of our forum's most passionate fan, Andrey :D
3) The picture shows Manezhnaya Square in Moscow. There have already been two instances of unrest there involving fans and their supporters.
4) Same place, basically blood, guts, riot police.
5) One of the oldest English national teams.