An ambitious army officer of Thai-Burmese ancestry,[1] Phao married the daughter of General Phin Choonhavan.

[2] He took part in the 1947 coup d'état that ended the last of Pridi Phanomyong's attempts to create democracy in post-World War II Thailand, restoring disgraced Field Marshal Plaek Phibunsongkhram to power.

Made deputy director of the police, Phao quickly staged a show trial of the alleged "assassins" of King Ananda Mahidol (Rama VIII), in which three members of the palace staff were found guilty despite a lack of evidence and were eventually executed even though they had earlier been found innocent.

A client of the CIA, Phao received funds and hardware to build his personal fortune, as well as the expertise of US paramilitaries such as James William Lair to turn the police into an alternative force to oppose his military rival, Sarit Thanarat.

He demanded protection money from businessmen, rigged the gold exchange, and blackmailed corporations into giving him huge shareholdings.