"The trade union federations have photocopied all signatures and checked their legibility. Lists with signatures weigh some 190 kilograms. We have not verified personal identity numbers (JMBG), this is a job for services in the parliament," Matijasevic said.
He stressed that the entire campaign was focused on labour legislation, ruling out politicisation.
The box with the signatures will be delivered just before parliament wraps up its current session so that the referendum is not called during the summer, when many citizens will be away on holiday, which would considerably undermine the chance of the referendum's success, according to union leaders.
The five trade union federations at midnight 23 June finished collecting signatures for the referendum. In order to make their request for a referendum valid, the unions had to collect at least 449,506 signatures (10 percent of the electorate) in the period from June 9 to 23.