Union members plan to use the International Workers Day, also known as May Day, to highlight the growing disparity between Oakland’s economic boom and workers’ pay.

Members of the Alameda County Building and Construction Trades Council, wearing hard hats and safety vests, plan to protest at two work sites in downtown Oakland on Wednesday morning to demand the developers hire local union workers.

A rally at Oakland City Hall is planned at 8:30 a.m and feature speeches from State Superintendent of Public Instruction Tony Thurmond, and local labor leaders Andreas Cluver, the secretary-treasurer of the Alameda County Building Trades Council, and Liz Ortega Toro, secretary-treasurer of the Alameda Labor Council.