§1543. Power to examine the records of third parties
For the purpose of administering the provisions of this Sub-title, the collector whenever he deems it expedient may make or cause to be made by any of his authorized assistants, an examination of the books, records, papers, vouchers, accounts and documents of any individual, firm, copartnership, joint adventure, association, corporation, estate, trust, business trust, receiver, bank, syndicate or other group or combination, in so far as said books, records, papers, vouchers, accounts and documents relate to, bear on, associate with, identify, clarify or disclose, the liability of any person or group made liable for any tax, excise, permit, or license under any Chapter of this Sub-title or assist in the enforcement or collection of any such liability. Every individual, director, officer, agent or employee of such individual, firm, co-partnership, joint adventure, association, corporation, estate, trust, business trust, receiver, bank, syndicate or other group or combination, shall exhibit to the collector or to any of his authorized assistants, the pertinent books, records, papers, vouchers, accounts and documents and to facilitate any such examination and investigation so far as it may be in his or their power so to do.