The government of New Caledonia's southern province has lodged a complaint with the public prosecutor against Sylvain Nea whose CSTNC union disrupted public life for much of the past three weeks.
The government says the roadblocks and the tyre burning around Noumea incurred the authorities tens of thousands of dollars in clean-up costs.
The complaint was lodged shortly before the end of an unlimited strike to get the SLN nickel company to reinstate two sacked workers.
The strike was settled only hours before SLN would have been forced to shut down the furnaces at its nickel smelter.
The CSTNC action caused massive and repeated traffic jams and saw the closure of the main bakeries and some banks.
The union says it will now focus on helping sacked workers at a hotel which has been blockaded and closed for the past two months.