So i'm GMing Shadow of the Demonlord and we are currently playing the "Tales from the Demonlord" Campagin.

Anyway: one of my players (rouge / now Asassin) is in really good terms with the thieves guild in Crossing. Another player (Mage / Witch) is part of a rebel group (as part of his random rolled background).

Now the Mage/witch is more of a trickster (likes Teleport spells) and told me that he will turn his rebel group ("Changelings are Human too") into a general "we fight against opression" kinda punks. So i'm ok with that and that he is able to find other changelings and teach some of them some basic teleportation spells. He also "invests" heavily into building a spy network by paying children to "watch out" for him and then maybe let them into his gang. He did with with teleport spells some great burglaries by teleporting into a room, taking the stuff and hopping out. Something that is not possible anymore (or at least not that easy) since several shop owners asked the local mage and his apprentice (another player) to sell them some protective scrolls... which the other player did of course

So ... we now have two crime syndicates and the trickster Mage/witch is full on "i really wanna control the slums and make a better live for the people there since nobody helps them" (which is not completly true but anyway), while the other players is a supporter of the current thieves guild

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TLDR: two players work for different crime syndicates (one of them doesn't know that the other player is actually the leader of the new gang) and it seems a gang war will come up. How do i play this out?? are there any good Modules with "Gang Wars" for which i could take some ideas??