Members of the California Nurses Association rallied in Sacramento, Calif., in May, in anticipation of contract negotiations with Kaiser Permanente that began this fall. April Dembosky / KQED hide caption

itoggle caption April Dembosky / KQED

Many of the machinists were not happy late Friday when it was announced that Seattle-area workers had approved a new contract with Boeing. David Ryder /Reuters/Landov hide caption

itoggle caption David Ryder /Reuters/Landov