Where the Collector has, under Section 4, purchased or taken a lease of any protected monument, or has accepted a gift or bequest, or the Commissioner has, under the same section, accepted the guardianship thereof, and such monument or any part thereof, is periodically used for religious worship or observances by any community, the Collector shall make due provision of such monument, or such part thereof; from pollution of desecration-
(a) by prohibiting the entry therein, except in accordance with conditions prescribed with the concurrence of the persons in religious charge of the said monument or part thereof, of any person not entitled so to enter by the religious usages of the community by which the monument or part thereof is used; or
(b) by taking such other action as he may think necessary in this behalf.