Any employee of the Bureau, upon written authorization by the Director, may enter any correctional center or mental institution to take or cause to be taken fingerprints or photographs or to conduct investigations relative to any person confined therein, for the purpose of obtaining information which may lead to the identification of criminals; and every person who has charge or custody of public records or documents from which it may reasonably be supposed that information described in this subchapter can be obtained, shall grant access thereto to any employee of the Bureau upon written authorization by the Director or shall produce such records or documents for the inspection and examination of such employee.