Members of the pro-worker Fed Up coalition, an initiative of the Center for Popular Democracy, hold banners and protest signs during a rally outside the venue of the Jackson Hole economic symposium, sponsored by the Federal Reserve Bank of Kansas City, in Moran,

Liberal advocacy group Fed Up launched a campaign nearly three years ago in hopes of persuading the nation's central bank to hold off raising its benchmark interest rate.

The group organized protests at the Fed's annual retreat in Jackson Hole, Wyoming. It demonstrated outside the Federal Reserve Bank of New York. And it recruited prestigious economists and former top central bank officials to the cause.