The National unio of Air Transport Employees is squaring off with Caverton Helicopters over the layoff of 150 workers in Nigeria, news outlets report.

The unio alleges protocol was not followed in the layoffs and has pledged to take action, including possible strikes.

Originally, it is reported, Caverton agreed to pay a severance package to any dismissed employees but the company only agreed to pay one month’s salary instead of notice and pension contributions up to last full month to the 150 laid-off employees. Caverton said it was complying with Nigeria law and the workforce reduction came after review of operational exigency and economic climate in Nigeria.

In response, the unio is demanding withdrawal of the layoff notices, a company staff-reduction plan and new discussions on a salary review and 2015 conditions of service. News outlets also report that another unio, the National Association of Aircraft Pilots and Engineers, is involved, with its leader alleging long delays in salary, pension-contribution and tax payments by Caverton.

Industrial action, or “job action” or “strike” as it may be known, could involve physically not going to work, refusal to perform while at work, or delayed or limited work. Caverton’s primary interests are in the oil and gas sector, operating out of the Murtala Muhammad International Airport in Lagos, Nigeria. The company operates a fleet of one Leonardo AW139, two Bell Helicopter 412EPs, a Sikorsky S-76C++ and two fixed-wing aircraft.