In the 3rd battle of Panipat thousands of maratha soldiers, women and children were held captive and kept as slaves and sex-slaves for about 200 years till 1948 when the Nawab Akbar Khan freed them . It is said that the decree of freedom for the slaves was not honoured in the remote areas of Balochistan. The marathas were hindu when enslaved, and were later converted to Islam. It is possible that the present day Bugtis are the descendants of the maratha slaves.
Excerpts from the book http://www.goodreads.com/book/show/1446414.The_Tigers_of_Baluchistan
In this book sylvia says that the mratta were enslaved by Humayun. The marathi speaking historians point to panipat.
In the following video african slaves of balochistan are displayed.