I think it is perfectly understood with scam, ideological and context in which you are. I still comment that the most common case is when someone who identifies with an ideology at some point behaves as if he has another (almost always opposite) and disappoints, when he does not betray, his followers and admirers.
IDEOLOGICAL SCAM use of legal means fraudulently. The typical case was the issuance of ideologically false invoices by the candidates for congress and the presidency of Chile, to obtain private resources to carry out their campaigns, in itself illegal, loading these donations to expenses and deducting taxes by simulating services that were never realized. Some synonyms, words or similar expressions may be used by legality to defraud the state
