I think it's the fraternal order of police, or someone associated with them calling for money. On my caller id it showed the number with "FOP". Doesn't mean it really is a police officer calling, I heard/read somewhere they outsource to a calling agency to round up money by phone solicitation.
None of them are police officers. Just callers who work directly for the State FOP. They'll keep you on the line until you finally give in to a donation of $12 or more. Ridiculous. Just hang up!!