The Fiji Trades Union Congress leader Felix Anthony has reported the leader of the regime, Commodore Frank Bainimarama, to the police.
Mr Anthony says he filed the report last month with Lautoka police.
He alleges military officers including the interim Prime Minister threatened and assaulted him and his colleagues.
This follows Mr Anthony's claims last year that he had been punched and kicked by at least five soldiers, leaving him with a damaged eardrum and bruising.
Mr Anthony says he has had difficulty trying to get medical reports from Lautoka Hospital where he was examined after the assault.
The military earlier denied the allegations, with its spokesman saying if the complainants can give proof of an assault, it should be to the police.
Police have yet to confirm to Radio New Zealand International whether an investigation is underway.