This started under Bill Clinton. I've made comments about it off and on for decades - it's the reason I joined FreeRepublic. I've known about the 'vast right wing conspiracy' since before Hillary spilled the beans about it...(thank God she did - citizens were able to make jokes about it - defusing a serious totalitarian move) At that time the Southern Poverty Law Center was working with (rouges?) in the FBI putting out lies about middle aged, middle class white men killing police officers - to move up in 'the priesthood' of the right wing.
I heard the story while with a person who wrote for the local paper... we both agreed that if large numbers of police officers were being killed by 'the right wing' newspapers would have picked up on it. As my friend pointed out there aren't many murders of police officers that are 'under the radar'...
As a reality check: National statistics show the 6% of citizens who are both black AND male are the most likely to kill a police officer. Middle class white men are among the least... Since democrats can hardly work together to order a pizza - it makes one wonder if this isn't supported by some communist group... with a long... long timeline.
I think this kind of thing really started to ramp up under GHWB. Ruby Ridge was on his watch and the planning for the Waco raid began six months or more before Clintoon took office.