Commissioner Fuiavailili Egon Keil said he received a letter signed by the caretaker Human Rights Protection Party (HRPP) member for Faleata West, Leala'ilepule Rimoni Aiafi.
Fuiavailili confirmed to RNZ Pacific the complaint related to FAST's impromptu swearing-in outside parliament on 24 May, which the Supreme Court last week ruled was not legal because of the Head of State's absence.
The complaint named FAST's leader and deputy leader, an MP who acted as Speaker and two of the parties legal representatives.
