Anarchists, whose mission in the world is the abolition of aggression and all the evils that result therefrom, perceived that, to be understood, they must attach some definite and avowed significance to the terms which they are obliged to employ, and especially to the words "State" and "government." Seeking, then, the elements common to all the institutions to which the name "State" has been applied, they have found them two in number: first, aggression; second, the assumption of sole authority over a given area and all within it, exercised generally for the double purpose of more complete oppression of its subjects and extension of its boundaries.
The Relation of the State to the Invididual (1890)