Bandits are members of the criminal underworld who came to the Zone for different reasons; to make money by selling artifacts, hide from the law or trade in weapons. The Zone is full of bandits, ranging from common thugs to serious criminals, most of whom are members of one gang or another. Although the Zone gangs frequently fight amongst themselves, the criminal element still poses a serious problem for normal stalkers.
Bandits are ruthless and generally hostile to anyone not in their gang. Though depicted in Clear Sky as a united, highly territorial faction, the bandit population in Shadow of Chernobyl consists mainly of roving groups.
bandits can make alliances with certain factions but to me it seems that the stalkers in the zone in general dont like bandits, i think the only factions bandits should be friendly with is themselves. as for the loners they can remain unfriendly, Duty Hostile, Military Hostile, Freedom Neutral, Mercs Neutral, Molonith Hostile, Ecologists Hostile