Federal regulators charged with implementing the Multiemployer Pension Reform Act of 2014 heard from concerned retirees and pension experts Thursday during a hearing convened by the IRS. “This is a dangerous precedent for all types of pensions,” Karen Ferguson, director of the Pension Rights Center, told the panel, which included officials with the Labor Department and the Pension Benefit Guaranty Corp., which also will have a role in approving any applications to cut benefits.