Grahorac was alluding to the setting up of barricades by ethnic Serbs in Serb-dominated areas at the start of the war to prevent the Croatian authorities from taking control of them.
The association gathers 4,200 former "Borovo" workers, mostly Serbs, who continued working after the Serb occupation of Vukovar. They were collectively sacked by the exiled factory management on December 3, 1991.
Since 2000, the workers have been demanding that their dismissal be revoked and years of service recognised and that they be given severance pay.
Grahorac said the workers were considering "radical measures" if their request was not met as soon as possible.
He said that the association had sent a letter to Prime Minister Ivo Sanader, urging him to respect the workers' rights and contribute to inter-ethnic trust.
The workers were supported by a senior body of the local branch of the Independent Democratic Serb Party (SDSS), but not by SDSS MP Milorad Pupovac.