In the recordings, managers list the names of union supporters they want to fire and talk about how to build a case that will stand up to NLRB scrutiny.
Smith faces former school board member Dan Ryan in the Aug. 11 runoff election for the vacant Portland City Council position held by the late Nick Fish.
Local 125 represents electric utility workers, power line clearance tree trimmers, and workers who construct and maintain transmission lines and substations in Oregon, Washington, Idaho, Montana, and Nevada.