Ван ден Берг
In July 1881, Van den Berg wrote a critique of the Holle's recommendations which called for strict monitoring Islam in the East Indies. In a matter of putting spies in Mecca, for example, according to Van den Berg, it is completely useless because most Arabs residing in Nusantara were from Hadhramaut. Hadhramis were considered strangers in the eyes of the Arabs of Mecca.