The infiltration of ranks in any public space including official government buildings happens at a cost. It’s a price that’s not easy to pay. This involves mental strain and strenuous activity. This is because the constant security checks can be wearying and the need to keep up the effort drains enthusiasm for the effort.
Therefore criminals have innovated further “Helps” to develop their activity beyond the usual refusals that such nefarious actors get. These work deep inside the networks that support our lives. They’re used to distract, divert, and manipulate information and resources. This makes infiltration possible.
The most basic example is a “Board”. It bridges a knowledge divide that criminals have between each other because they join the gang at different times. The “Board” orientates the group as a single reference point. This makes it possible to think together and to work together more closely.