Among several ways of trying to suppress terrorist conspiracies, infiltrati
on has probably received the least attention. Impressionistic evidence sugg
ests that conspiracies that carry out violent attacks usually have a small
number of participants, and that large conspiracies either fail to material
ize, fail to organize actual attacks, or are substantially less difficult t
o uncover. Due to the prevalence of weak social ties in larger groups there
may be an intermediate group size, around 7-10 members, that is highly sub
ject to infiltration. Building on work by Freeman, Granovetter, and others,
this study examines a few features of the social ecology of interaction ti
es. We introduce a procedure for counting, within groups of size n, all int
eracting pairs {P, Q}, where P and Q are disjoint or nonoverlapping subsets
(Freeman, 1992: 153) of a given group; these subsets usually contain more
than one person, i.e., the interacting units do not invariably consist of i
ndividuals. This procedure generates interaction configurations having uniq
ue patterns of strong, weak, and "weakest'' ties - i.e., three levels of ti
e strength corresponding to core, primary, and secondary ties in Freeman's
terminology - such that relatively weak ties predominate within larger cons
piracies. We speculate about ways in which these configurations may evolve
through time.
We then use a combinatorial analysis of group structure to develop a rough
calculation of the probability of infiltrating conspiracies of size n, and
we show that relatively large conspiracies, having 7 or more members, tend
to have interaction structures that make them highly vulnerable to infiltra
tion. Finally, Collins' (1985: 170-172) approach to interaction-chain analy
sis suggests that, while in real situations it would be hard to anticipate
departures from our probability model, attempts to "turn around'' conspirat
ors with weak ties appear to have a fairly high prospect of success.
But the child's sob in the silence
Curses deeper than the strong man in his wrath.
Elizabeth Barrett Browning, "Cry of the children''.