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In 1972, the National Awami Party or NAP formed the first elected government in Balochistan after winning the elections and Attaullah Mengal was sworn in as the first Chief Minister of Balochistan. But just nine months after the formation of the NAP Government, it was overthrown by Bhutto who used Nawab Akbar Bugti's allegation that Mengal's regime wanted to disintegrate Pakistan and liberate Balochistan as grounds for this dismissal. Attaullah Mengal, Ghaus Bakhsh Bizenjo, Gul Khan Nasir, Nawab Khair Bakhsh Marri and the other NAP leaders were thrown in jail. They were released when Bhutto's government was toppled by Zia-ul-Haq, after spending more than four years in captivity. By this time differences had arisen between the NAP leadership, so while Mengal, Bizenjo and Nasir went to the NAP headquarters, Khair Bakhsh and Shero Marri headed home.
Later, Ghaus Bakhsh Bizenjo formed the Pakistan National Party or PNP after differences arose between him and Wali Khan over the Kabul Revolution (he supported the revolution while Wali Khan was against it). Gul Khan joined PNP and became the President of its Balochistan wing while Attaullah Mengal went into exile in London.
In 1996, Attaullah Mengal returned to Pakistan and formed the Balochistan National Party