Given the anarchy and violence fomented by leftist totalitarians in many of our cities currently...IMO the article in the original post might make an interesting re-read...
Soviet Invasion of Czechoslovakia
On August 20, 1968, Warsaw Pact forces--including troops from Bulgaria, the German Democratic Republic (East Germany), Hungary, Poland, and the Soviet Union--invaded Czechoslovakia. Approximately 500,000 troops, mostly from the Soviet Union, poured across the borders in a blitzkrieg-like advance.
The invasion was meticulously planned and coordinated, as the operation leading to the capture of Prague's Ruzyne International Airport in the early hours of the invasion demonstrated. A special flight from Moscow, which had prior clearance, arrived just as the Warsaw Pact troops began crossing the borders. The aircraft carried more than 100 plainclothes agents, who quickly secured the airport and prepared the way for a huge airlift. Giant An-12 aircraft began arriving at the rate of one per minute, unloading Soviet airborne troops equipped with artillery and light tanks. As the operation at the airport continued, columns of tanks and motorized rifle troops headed toward Prague and other major centers, meeting no resistance.
By dawn on August 21, 1968, Czechoslovakia was an occupied country. During the day, the Ministry of Foreign Affairs "with the endorsement of the President of the Czechoslovak Socialist Republic and on behalf of the Government of the Republic" transmitted to the governments of the invading countries "a resolute protest with the requirement that the illegal occupation of Czechoslovakia be stopped without delay and all armed troops be withdrawn." That evening in a nationwide radio broadcast President Svoboda stated that the Warsaw Pact forces had entered the country "without the consent of the constitutional organs of the state," thus officially denying the Soviet claim that they had been invited into the country to preserve socialism. The people of Czechoslovakia generally resented the presence of foreign troops. They demonstrated their objections in mass gatherings in the streets and by various acts of passive resistance. The invading troops could see that they had not been invited into and were not wanted in Czechoslovakia.
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https://www.globalsecurity.org/milit...oslovakia2.htm