@HistoPol for the cops they were *furious* about things like Miranda rights. They were victims of an unjust system that picked on them. LEOBORs were around at local levels but at that point civilian review boards were becoming popular--and that REALLY pissed them off.
The John Birch's biggest campaign was "support your local police" in response to CRBs. At the 1972 RNC on Miami Beach the police rioted and covered the island, an island full of old people in tear gas. People demanded CRBs.