Fraud that targets people belonging to a particular community or group, typically that in which someone pretends to be a member of the group in order to gain the trust of others.
the dangers of pyramid schemes and affinity fraud
Definition of affinity fraud in US English:
affinity fraud
noun
Fraud that targets people belonging to a particular community or group, typically that in which someone pretends to be a member of the group in order to gain the trust of others.