"And, so, that was when Ron’s final betrayal to the Order of the Phoenix took place ... for it was by using the information that Arthur had carelessly given him access to, by not covering his own cowardly flight from Britain, that Ron came into possession of a complete list of active and operating members of the Ratway, locations of our safehouses, transport and meeting hubs, and the top underground Magicals who were co-ordinating our most dangerous efforts of resistance.