One of organized labor’s strongest calling cards, politically if not economically, is that unions protect the long-term interests of employees. If workers join, the argument goes, they will be far better off. Yet rhetoric too often hasn’t matched reality, and perhaps nowhere more so than in the area of retirement plans. That’s the conclusion of a recent study by Diana Furchtgott-Roth, senior fellow with the Hudson Institute in Washington, D.C. Furchtgott-Roth, chief economist for the U.S. Department of Labor (DOL) during 2003-05, authored a report released this month by the institute titled, “Unions vs. Private Pension Plans: How Secure Are Union Members’ Retirements?” Employer-sponsored pensions, she concludes, deliver more security for nonunion employees than union-managed funds do for their own members.