"or even checking these manifestations of the communistic spirit. It is conceded that these men have a lawful right to band together in secret, to bear arms..."

Public Ledger, “They number many thousands, and include what are regarded as the most dangerous elements of our heterogeneous population. . . . or even checking these manifestations of the communistic spirit. It is conceded that these men have a lawful right to band together in secret, to bear arms and to drill, and that a criminal intention cannot be assumed in advance of criminal acts….”, May 10, 1878

   And yes, it indeed was "conceded" one year later in Chicago:

“The right exists whether the constitution contains that clause or not.”

Illinois–Cook County Circuit Court.

 
People, Ex. Rel. Bielfeld, v. Affelt.

 
[1879]