76
Chapter 6. Modelling asymmetric relationships with multiple types
Figure 6.5: Our directed embedding of the Chalonero social network (untyped edges)
different ways.
Law enforcement targeted members of the group by intercepting telephone
calls and by observing meetings. They had access to the content of telephone calls,
and so were able eventually to determine with precision the functions of members of
the group, and who its leadership were. We consider the social network as containing
two different edge types: directed edges representing phone calls, and undirected
edges representing participation in meetings. Thus, a meeting among three people is
represented as a 3-clique (triangle) of undirected edges, a meeting among 4 people
as an undirected 4-clique, and so on.
Chalonero organization
For both criminal networks we use only the individuals with at least two contacts and
who participate in at least five communications. In the embeddings, we label the key
nodes (known from the content of interceptions in the law enforcement investigation)
with numbers in a larger font size.
In Chalonero, the general structures in the three embeddings of Figures 6.5,
6.6 and 6.7 are similar. N2 was one of the most active traffickers and the son of
the group leader, N1. N2 is placed centrally in the embeddings. Furthermore, N2’s
four added edges are long, as showed in Table 6.2. The meeting edge lengths are
significantly smaller than the others, because these edges are undirected.
N1 was a fugitive during the investigation, and he was unable to manage the
group’s activities directly. He never spoke on the telephone, preferring to issue orders
Chapter 6. Modelling asymmetric relationships with multiple types
Figure 6.5: Our directed embedding of the Chalonero social network (untyped edges)
different ways.
Law enforcement targeted members of the group by intercepting telephone
calls and by observing meetings. They had access to the content of telephone calls,
and so were able eventually to determine with precision the functions of members of
the group, and who its leadership were. We consider the social network as containing
two different edge types: directed edges representing phone calls, and undirected
edges representing participation in meetings. Thus, a meeting among three people is
represented as a 3-clique (triangle) of undirected edges, a meeting among 4 people
as an undirected 4-clique, and so on.
Chalonero organization
For both criminal networks we use only the individuals with at least two contacts and
who participate in at least five communications. In the embeddings, we label the key
nodes (known from the content of interceptions in the law enforcement investigation)
with numbers in a larger font size.
In Chalonero, the general structures in the three embeddings of Figures 6.5,
6.6 and 6.7 are similar. N2 was one of the most active traffickers and the son of
the group leader, N1. N2 is placed centrally in the embeddings. Furthermore, N2’s
four added edges are long, as showed in Table 6.2. The meeting edge lengths are
significantly smaller than the others, because these edges are undirected.
N1 was a fugitive during the investigation, and he was unable to manage the
group’s activities directly. He never spoke on the telephone, preferring to issue orders