They include Methee Na Nakhon, chairman of the southern provincial election panel. Only four election members remained to perform their duty.
Mr Methee said in his resignation letter that there was a high risk that the scheduled registration of MP candidates in the province’s six constituencies would turn violent, threatening the safety of election officials and local people.
He had tried his best to hold talks with the protesters to pave the way for a smooth registration, but the attempts failed. Therefore he and others members decided to step down.
Hundreds of protesters, led by about 10 women wearing a cloth covering over their breasts traditional to river people have surrounded the registration centre at the provincial sports stadium for four straight days.
At 2pm Tuesday, about 20 MP candidates of Bhumjaithai and other political parties arrived at the stadium for registration, but were blocked by the anti-election protesters, who shouted and blew whistles at them.
The MP applicants gave up and went to Muang Surat Thani police station to file complaints. There was no violence.
The protesters then moved to rally in front of the Surat Thani provincial hall, to pressure the remaining four EC committee members to resign.