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As other repressive governments , particularly Poland and the Soviet Union , have recently discovered , initial steps to open up society can create a momentum for radical change that becomes difficult , if not impossible , to control .
 geographical social political: Poland; geographical social political: the Soviet Union
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 geographical social political: Poland; geographical social political: the Soviet Union