Which preposition to use with obstructors

of Occurrences 1%

Order!" as did his successor Speaker Peel, while Pym, Hampden, Cromwell, and Vane passionately inveighed against Prelacy and the "Man of Blood," as I had just heard the Radicals of the Victorian era overwhelm with diatribe the obstructors of the popular will.

Which preposition to use with  obstructors