Albert Parsons was one of the five Chicago Anarchists who were tried in 1886-1887 and executed in November 1887 for their role as 8-hour working-day agitators and as anarchist militants. Anarchists are decried as dangerous by cops, politicians, and the rich, if anarchists had their way those roles would no longer exist. So yes, Albert Parsons may be considered dangerous for being an anarchists.
There are no states that are prohibited from taxing by the U. S. Constitution. Such a prohibition may or may not be placed in the State's Constitution or Charter or such.
It certanely suprised the Americans even after they informed of incoming attack by Yugoslavian agent Dusko Popov and it rose up the morale of all Americans,and i believe this was a jump board for turning up the tide of the war to allied side.