On April 17, 1975, as the Khmer Rouge entered Phnom Penh, this group took out a motor-cavalcade on the streets of the capital welcoming the arrival of the Khmer Rouge.

[1] The group consisted of a handful of soldiers, dressed in black uniforms, accompanied by a number of students.

[1][2] Initially tolerated by the Khmer Rouge, MONATIO members were later rounded up and executed.

[2][3] The Khmer Rouge regime later claimed that MONATIO had been a CIA conspiracy against the revolutionary government.

[4] A movie on the events of 1975, called MONATIO, was made by Norodom Sihanouk.