an ve santt. laurent store. these are likely crews associated with gangs. how do they organize for one given hit? it s word of mouth, so an electronic version. somebody sends out a text message, we re thinking of doing a hit on thursday, here s where we re thinking of doing it, who s in. some will speak in person, but they ll begin to gather. it s who s going along, what vehicles are with using. reporter: there have been 107 flash mob robberies. can law enforcement catch up to these perpetrators? miller believes they can with the fbi and marshals able to bring u.s. federal charges. once you begin to find the shot callers, the organizers of these groups and swarms and they start to face federal charges under the hobbs act for organized crime and theft, that s usually what will break a