In the past three decades, more than two dozen civil conflicts have ended in a long-term truce between the government and rebels. In these agreements, neither side disarms or makes any substantial concessions. Instead, rebel forces are permitted to recruit, fund themselves, and patrol territory without punishment so long as they leave government forces alone. Governments typically offer these agreements when they have few domestic or political interests in the conflict (as in remote separatist regions) or when they face short-run international pressure to reduce violence (as in high-profile conflicts). What happens to rebel organizations when the government permits them to operate and recruit freely? Governments and scholars believe ...