ORMO informants were placed everywhere within the nationalized industry. With time, as the political situation in Poland stabilized, postwar submachine guns were replaced with concealed weapons. ORMO men did not receive monthly salaries, but were showered with regular monetary bonuses and state privileges. They were given new apartments, talons for cars, exclusive vacations and access to police health clinics, as well as better job placements. They were thoroughly indoctrinated and feared by the general population. The next widely known operation by the ORMO took place during the March 1968 events, simultaneously in several major cities across Poland. On March 8 – while the regular MO watched students protests passively (partly out of respect for the autonomy of Warsaw University) – ORMO "worker-squads" stormed into the buildings armed with clubs, and performed swarm beatings of students in classrooms, along corridors and at the university halls. Similar operations followed in Kraków (March 14–20), Lublin, Gliwice, Wrocław (March 14–16), Gdańsk and Poznań, against striking students. At least 2,725 people were arrested. The success of the ORMO attack on universities in the wake of growing citizen discontent (see Polish 1970 protests) prompted the Ministry to begin massive expansion of its rank and file. By 1979, ORMO reached over 450,000 members. The nascent Solidarity movement took communists by surprise. By mid-1981 the membership of the Trade Union reached 9.5 million, of the working-age population of Poland. In this case, the ORMO formations weren't used against striking workers because many of its volunteers had become demoralized by public resentment. The show-of-force operations were confined only to major urban centres. The membership dropped dramatically. With the crushing of Solidarity by the 1981 military coup, all special operations were taken over by motorized police, the ZOMO, and SB MSW. Attempts at restructuring ORMO as the Party's own self-defence force (carried out by Kiszczak) failed miserably. In the following years many regional cells were closed down due to a lack of volunteers. Finally, in 1989 ORMO was officially dissolved by the Sejm. Similar formations: