The group has not formed for its own sake, but is needed in order to carry out the crime. Different individuals assume various roles, or "trades". The term "organisation" should, however, not be taken too literally. As a rule, the groups are very flexible — people come and go, the operation falls off but then mobilises again when the next project is to be carried out. But it can still be spoken of as an organisation with a solid core that sets the operation in motion and controls it. Usually, the organisation benefits from keeping a low profile. They want to operate on the illegal market without being seen.
But there is also a much more visible kind — organisations where community and brotherhood apparently mean more than the criminal operation. It is criminal gangs that can spread anxiety by their provocative behaviour and visible symbols, such as vest tops and emblems.