builder - i want that department should take full tax

Income Tax Raids.
I want to pass on information to income tax deptt. against my one of our neighbour ,who have gathered huge black money & possess dis-proportionate wealth against their known souces of income . The said persons are hoarders, land grabbers and also have huge pramod association properties and who are very rude with everybody
As a law abiding citizen, I request for the procedure and information by which I can highlight their misdeeds to income tax deptt. name of the builder is pramod gupta