My qustion is this? Once the alarm has sounded can you, if you use a militia man to attack another player and win the fight make him leave the district if you can move him out !? You could then force a member of another gang out of the district and stop him from bring any or not a much treasur out!?

i'd say it's ok to move a thieve out... but what for? sure, if he stays in the district he could get some loot for his team, but if u succeed in blocking his way out of the district (which is not that hard with 3 or 4 players) his team will loose money at the end of the game...