This summer, shortly after scores of camo-wearing, heavily armed federal agents descended on Portland, Ore., to attack protesters, Charles Fried, Ronald Reagan’s solicitor general, pondered the implications of what he was seeing on the streets. What he saw scared him; he remembered the use of paramilitaries by fascist leaders in 1930s Europe, where he was born, and he feared he was now witnessing a slide into paramilitarism in the United States.