Mr. Martin Callinan:

It would be dangerous to speculate, and that is also true in putting numbers on subversive organisations. Generally, there is an inner and outer core, with a network of loosely associated family members etc. For example, a particular group may be involved in conducting armed robberies for the purpose of procuring cash to buy drugs. It might farm out certain duties, such as stealing cars or other specialisation, to other criminals further down the food chain. It is particularly difficult to formulate a number.