The Lyran backwater planet civil war scenario book that I can't recall the name of ATM deals with some police and uprising forces either assisting or hindering the player group, as well as media spin if casualties are taken and media manipulation in general.
A quick note on fun games, chasing a hovervehicle holding the rebels who have just robbed/bombed/killed/whatever through a city in an appropriate battlemech can be super fun when playing a double blind game, especially if you are trying to capture them instead of reduce them to carbon. It's also rather fun escaping the pub/officers club/warehouse/whatever under the same circumstances if the bad guys have organised an ambush.