The trade union of explosives disposal specialists organised this protest rally.
The union's vice president, Niko Rezic, told reporters that the protesters would continue picketing the government building until their demands were met.
Rezic said he was willing to take part in a session of the Croatian Privatisation Fund (HFP) to discuss a possibility for the company to go into receivership on condition that all employed mine removal experts would retian their jobs in the company.
The government decided to hold the session with the HP on this topic later in the day.
According to information on AKD Mungos' web site, the company employs 260 workers, 183 of whom are explosives disposal specialists.