In 1974, students demanded an end to a particularly third-rate triumvirate, who had nonetheless empowered enormous economic growth. After bloodshed reached an intolerable level, by Thai standards, the king sent all three packing - to Boston and Taipei. He'd known them well and worked through them but realized their time had passed. And the king's power grew immeasurably in that decisive move.
No. 'All three' does. He sent the triumverate packing.