affinity fraud
n.— «When the scoundrel running the fraud is a trusted person, it makes the crime even more repulsive. Affinity fraud, as it is known, often includes people who put themselves in positions of trust at churches or schools, in social and civic organizations and other environments, only to financially abuse the relationships.» —“Learn from the college of deception” by George Chamberlin North County Times (Escondido, California) Apr. 15, 2007. (source: Double-Tongued Dictionary)