For my story, it's a thriller set in modern day America, and in it, a group of cops form a group to get revenge on the villains, who killed their friend, who was a cop. However, I want the villains to find out that there is a group of rogue cops out to get vengeance on them. This will motivate the villains into their plan of action, once they find out. But how would a gang of crooks find something like that out? I mean let's say the police are looking for the group of vengeful cops, and are trying to stop them. If the villains have a police radio scanner, would they find out that there is a group out for revenge over the radio? The police will probably talk on the radio, and say to be on the lookout for so and so, but they will not actually say that the cops they are looking for, are out for revenge and they need to be stopped therefore, will they? Or the police commissioner could go to the media and make an announcement that there is a group of cops they are currently looking for who are out to seek revenge on the people who killed the cop. The police do not know who the killer is, and just have hunches, hence why a group wants revenge, since the killers were not caught. So the commissioner could announce on the news, for the mystery suspects to watch out for these cops, whoever they are. But even if a gang of mystery suspects are in danger, the police commissioner is probably not going to get on the news to warn them and admit that there might be a group of vengeful cops looking for them. So if those two do not work, are there anyway that the villains could find this out maybe with today's technology?