 Complete the following phrase:  The survival of Solidarity was an unprecedented event not only in Poland, a satellite state of the USSR ruled in practice by a one-party Communist regime, but the whole of the Eastern bloc. It meant a break in the hard-line stance of the communist Polish United Workers Party, which had bloodily ended a 1970 protest with machine-gun fire killing over thirty and injuring over 1,000, and the broader Soviet communist government in the Eastern Bloc, which had quelled both the 1956 