Mezue ahịrịokwu na-esonụ: Na 1968, mgbe Prague Spring gasịrị, mba ahụ bụ
ndị agha Warsaw Pact (People's Republic of Bulgaria, People's Republic of Hungary, People's Republic of Poland, na Soviet Union, ewezuga Socialist Republic of Romania na People's Socialist Republic of Albania) wakporo na 1968, na-akwụsị oge ịtọhapụ n'okpuru nduzi nke Alexander Dubček. E gburu ụmụ amaala Czechoslovak 137 ma merụọ 500 ahụ nke ukwuu n'oge a na-arụ ọrụ.