@jalcine @petergleick "The “Blue Power” movement was led by the Portland Police Association, the police officers’ union. Officially recognized in 1942, the PPA was the first police union in the nation... After the city recognized the PPA as the bargaining representative for the Portland Police Department... PPA organized an informational picket of the ports along the Willamette River, effectively shutting down shipping... dockworkers refused to cross picket lines."
https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1068&context=usp_fac