It is not any one politician or public office holder past or present
it is the public service sector public officers and civil servants in govt Ministeries, Departments and Agencies
according to accountant general MDAs failed to remit whooping 4trillion...

http://www.thisdaylive.com/articles/auditor-general-indicts-mdas-over-non-remittance-of-n4tn/131196/

whereas we are concerned about catching one big thief millions and billions meant do deliver service & infrastructure are looted daily from the national treasury in the about 600 MDAs...
How do they loot this funds do it? In many ways...we shall look at them subsequently
sanitize the public service sector and you will clean Nigeria... in fact they are they ones that teach the policians how to steal...