Oratorio for Prague (Oratorium pro Prahu), shot in 1968 by Czech director Jan Němec, was suppressed by Soviet authorities; it's still hard to find. Němec and his crew shot astonishing footage of Soviet tanks and troops invading Prague. The citizens gather and a few are killed by the soldiers, and some of the tanks are put on fire. Němec also shows idyllic scenes of the Prague spring, including some sort of hippie festival.
