More than a million people risk losing their federally insured pensions in just a few years despite recent stock market gains and a strengthening economy, a new government study said on Monday.

The people at risk have earned pensions in multiemployer plans, in which many companies band together with a union to provide benefits under collective bargaining. Such pensions were long considered exceptionally safe, but the Pension Benefit Guaranty Corporation reported in its study that some plans are now in their death throes and cannot recover.

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