The Tonga Public Service Association says its acting president, Vili Vete, has been forced to go on immediate leave by the government.
The union says the government made this demand because Mr Vete had signed a letter demanding that the commissioners of the Public Service Commission resign.
The union had claimed, in the letter, that the PSC had not been working in the interests of public servants and was too close to the government.
Mr Vete, who has been with the Ministry of Education for 43 years, was handed the resignation demand yesterday by the CEO of Education, Dr. Uili Fukofuka.
The union says Dr Fukofuka was apologetic, saying the decision came from the government.