LINCOLN -- Groups representing retirees and union workers are planning to encircle the Federal Building in Lincoln to protest possible Social Security benefit cuts. Group members will form a "human chain" around the Federal Building and U.S. Courthouse on Tuesday. The gathering organized by the Nebraska Alliance for Retired Americans and the Nebraska State AFL-CIO is protesting a change that would result in smaller annual increases for Social Security recipients as a way to protect against inflation. Supporters say the current formula is outdated and doesn't reflect actual cost-of-living increases. Group members argue that a new proposed measure, the chained Consumer Price Index, fails to account for large health care costs for seniors and people with disabilities.