A clandestine cell system is a method for organizing a group of people such that such people can more effectively resist penetration by an opposing organization. In a cell structure, each of the small group of people in the cell know the identities of the people only in their own cell.

What is a sleeper cell person?

: a terrorist cell whose members work under cover in an area until sent into action.

What are sleeper cells in terrorism?

noun. a terrorist who is not currently active but assumes a guise in order to be in position, unsuspected, for future terrorist activities.