All of the criminal organizations have informants but many of these informants fall into many spectrum or categories. For, example in Mexico the cartels use snitching as a weapon. Some times the "estacas"(cell of 5-6 emforcers) and their commadantes(captains, local bosses etc.), have the Marines number on their cell phones to call the authorities to either snitch on a rivals hideouts or rival commadantes etc. or sometimes use them in a shootouts so they' can eliminate their rivals. The Golfos from Camargo were using the Marines to kill Zetas that were making an incursion into town or challenge each other via radios they carry into clashes or "topomes" in the middle of town many times. Both sides play a very dirty rode but the Golfos are more likely to use the army or marines as an indirect weapon. All cartels have informants inside the police to either advice them on army, federal police, and marines units around tone to know exactly where they are at all times plus hundreds of "halcones" or street guys reporting info about mainly army and marines units but also suspicious vehicles or people. Them you have snitched like Z-40 that co operated with the DEA to give out I of about the regional bosses to consolidate power within the Los Zetas group or Vicentilo being am DEA informant and I form on rivals to give him temporarily immunity to pass drugs etc. All organizations have snitches, there is no criminal organization that doesn't have.