HARRISBURG — Legislation that would weaken the ability of public-sector labor unions to collect dues and political action committee contributions from members’ paychecks narrowly passed the Pennsylvania Senate on Wednesday, although it is opposed by Gov. Tom Wolf.

The bill passed, 26-23, with only Republican votes in the GOP-controlled Senate. It did so without much fanfare now that it faces a veto from Wolf, a first-term Democrat who is supportive of labor union rights.

Last year, heavy opposition from organized labor brought out enough union members to pack the Capitol’s marble Rotunda amid warnings that out-of-state billionaires were aiming to make Pennsylvania the next northern industrial state to weaken union rights. At the time, then-Gov. Tom Corbett said he would sign such legislation.

The sponsor, Sen. John Eichelberger, R-Blair, said the bill would make it clear the government “cannot collect political money through their payroll system.”

The bill is supported by historic opponents of organized labor. All 19 Democrats and four southeastern Pennsylvania Republicans opposed it, labeling it a calculated attack on the existence of public-sector labor unions and the middle class.

“I don’t think the case was made ... that this was something other than targeting the union sector to make it more difficult for them,” said Sen. Dominic Pileggi, R-Delaware, who cast a “no” vote.

Sen. Vincent Hughes, D-Philadelphia, said the bill is an unconstitutional effort to “try to shut down the voice of working people.”

Under the bill, the state government, school districts and local governments would be barred from the practice of deducting voluntary amounts from the paychecks of unionized employees for issues or political advocacy, including contributions to union political action committees.

Government employers would still be able to continue the practice of deducting a “fair share” amount to pay for the cost of negotiating labor contracts and otherwise representing employees.