German Spies in England by William Le Queux

The German spy system, as established in England, may be classified under various heads -- military, naval, diplomatic, and also the _agents provocateurs_, those hirelings of Germany who have, of late, been so diligent in stirring up sedition in Ireland, and who, since the war began, have endeavoured, though not successfully, to engineer a strike of seamen at Liverpool and a coal strike.

First, every German resident in this country may be classed as a spy, for he is, at all times, ready to assist in the work of the official secret-agents of the Fatherland.