Right-to-Work supporters gathered in Manchester on Thursday, while Right-to-Work opponents protested outside.
The occasion was the release of a Right-to-Work study by the conservative advocacy group Americans for Prosperity.
Right-to-Work laws forbid unions from requiring membership.
"When unions can't force people to pay dues, they have to be more responsive to their members," said Matt Peterson of the Center for Worker Freedom. "They actually compete in the marketplace of ideas, and I think it will make them better, stronger organizations."
Opponents argue that Right-to-Work only weakens unions, because employees who do not pay dues still benefit from the contracts negotiated by unions.
Right-to-Work supporters are planning on introducing another Right-to-Work bill in 2015. The legislature came closest to passing Right-to-Work in 2011, but failed to override Gov. John Lynch's veto.
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