post office factories

To obtain weapons, bands of anarchists raided gun shops, police stations, and arsenals; the Mausers and Brownings thus acquired became their most cherished possessions. Once armed with pistols and with crude bombs produced in makeshift laboratories, they proceeded to carry out murders and expropriations of money and valuables form banks post offices, factories, stores, and the private residences of the nobility and middle class.
Attacks on employers and their enterprises—acts of economic terror—were daily occurrences throughout the revolutionary period. In Bialystok, sticks of dynamite were tossed into factories and apartments of the most loathed manufacturers. Anarchist agitators in one leather factory provoked the workers into attacking the boss, to jump out of the window to escape his assailants. In Warsaw, partisans of the Black Banner (Chernoznamentsy) robbed and dynamited factories and sabotaged bakeries by blowing up ovens and pouring kerosene into the dough. The Chernoznamentsy of Vilna issued an open declaration in Yiddish to the factory workers, warning them against company spies who had been planted among them to ferret out terrorists. “Down with the provocateurs and spies! Down with the bourgeoisie and the tyrants! Lone live terror against bourgeois society! Long live the anarchist commune!”
Incidents of violence were most numerous in the south. The Chernoznamensty of Ekaterinoslav, Odessa, Sevastopol, and Baku organized battle detachments, who set up bomb laboratories, perpetrated countless murders and holdups, bombed factories, and fought in gory engagements with the detectives who raided their hideouts. On occasion, merchant vessels docked in the port of Odessa were targets of anarchists “Ex’s” as the expropriations were called, and businessmen, doctors, and lawyers were forced to contribute money to the anarchist cause under the penalty of death.
[…]
In the eyes of the Chernoznamentsy, every deed of violence had the merit of stimulating the lust of the great unwashed for vengeance against their tormentors. They needed no special provocation to throw a bomb into a theater or restaurant…A member of Chernoe Znamia in Odessa explained this concept of bezmotivnyi terror to the judges officiating at his trial: “We recognize isolated expropriations only to acquire money for our revolutionary deeds. If we get the money, we do not kill the person we are expropriating. But this does not mean that he, the property owners has bought us off. No! We will find him in the various cafes, restaurants, theaters, balls, concerts, and the like. Death to the bourgeois! Always, wherever he may be…”
—  Paul Avrich, The Russian Anarchists, pp. 46-48 (1967)