Labor unions across New York are rallying their resources to oppose the approval of a constitutional convention, a referendum that voters will consider next month.

“We are certainly motivating the entire two and a half million member movement over the next six to seven weeks to defeat it,” said New York AFL-CIO President Mario Cilento.

The issue for labor unions is the possibility a convention would strip away hard-won rights, like collective bargaining.

“With those strong labor protections comes a way of life. We want to be able to protect what we have for ourselves and our families well into the future and that’s why the labor movement in this state is so adamantly opposed to a constitutional convention,” Cilento said.

The campaigning includes raising the issue with workers in newsletters and at meetings.

“We’re going to be doing phone banking and also labor to labor walking door to door just like we do in election campaigns,” said Communications Workers of America Legislative Director John O’Malley.

Supporters believe a convention could be a benefit to New York and revise an antiquated document. And other groups, like the New York Green Party are remaining neutral.

“I think that a constitutional convention in theory could be very good for New York state if the people could be heard, but unfortunately with the amount of money poured into these elections, we’re likely to see attacks on the fundamental rights of New Yorkers,” said Green Party Coordinator Peter LaVenia.

And if the convention is approved, expect labor groups to try to have a say in the process when delegates would be slated to run next year.

“We will try to have as much a voice as we can at the delegate convention, but the fact of the matter is the best way to ensure those rights for working men and women is to defeat,” said Cilento.

Voters in New York consider whether to hold a convention every 20 years. The last convention was held in 1968 and produced no changes to the constitution.