4 
local Gangs = {
	{
		Group = "AMBIENT_GANG_BALLAS",
		Models = {
			"g_m_y_ballasout_01",
			"g_m_y_ballaorig_01",
			"csb_ballasog",
			"g_m_y_ballaeast_01",
			"a_m_y_soucent_02",
			"g_m_y_strpunk_01",
			"ig_ballasog",
			"g_f_y_ballas_01",
			"csb_grove_str_dlr"
		}
	},
	{
		Group = "AMBIENT_GANG_FAMILY",
		Models = {
			"g_f_y_families_01",
			"g_m_y_famfor_01",
			"g_m_y_famdnf_01",
			"g_m_y_famca_01",
			"mp_m_famdd_01",
			"csb_ramp_gang",
			"ig_ramp_gang"
		}
	}
}

local CurrentGang = nil

Citizen.CreateThread(function()
	while true do
		if CurrentGang == nil then
			-- Default Gang NONE
			RemovePedFromGroup(GetPlayerPed(PlayerId()))
			CurrentGang = "NONE"
		else
			local SuspectedGang = FindPlayerSupposedGang()
			if CurrentGang ~= SuspectedGang then
				-- Gang Change
				if SuspectedGang ~= "NONE" then
					SetPedRelationshipGroupHash(GetPlayerPed(PlayerId()), GetHashKey(SuspectedGang))
					CurrentGang = SuspectedGang
				else
					RemovePedFromGroup(GetPlayerPed(PlayerId()))
					CurrentGang = "NONE"
				end

				-- Safe Respawn Catch
				if CurrentGang ~= "NONE" then
					if GetPedRelationshipGroupHash(GetPlayerPed(PlayerId())) ~= GetHashKey(CurrentGang) then
						SetPedRelationshipGroupHash(GetPlayerPed(PlayerId()), GetHashKey(CurrentGang))
					end
				end
			end
		end
		Citizen.Wait(0)
	end
end)

function FindPlayerSupposedGang()
	local ped = GetPlayerPed(PlayerId())
	for a = 1, #Gangs do
		for b = 1, #Gangs[a].Models do
			if IsPedModel(ped, GetHashKey(Gangs[a].Models[b])) then
				return Gangs[a].Group
			end
		end
	end
	return "NONE"
end

To be fair you don’t really need them long lines of code when you can break it down into tables and loops.

To sum it up this code will basically make the AI treat you as one of their own. If someone shoots at you they will attack etc. You can not shoot your team though. If you want to enable friendly fire on your gang then you could mess with some natives to do that.

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