Two low-level armed conflicts, Indonesia’s East Timor and Ivory Coast’s post-2010 election crises, provide detailed qualitative evidence of highly structured intergovernmental organizations (IGOs) engaging in effective civil warpreventing activities in member-states. Highly structured IGOs threatened and sanctioned each of these states and offered (long-term) benefits conditional on successful crisis resolution. The governments were aware of and responded to these IGOs’ concerns, as did the rebels in these respective cases. The early stages of the conflict in Syria in 2011 provide a counterpoint. With Syria’s limited engagement in only few highly structured IGOs, the Syrian government ignored international calls for peace. And, without highly structured IGOs’ counterweight to curtail the government, the rebels saw little reason to stop their armed resistance. The result was a brutal and deadly civil war that continues today.