241665
In 1960s and 1970s the company started production of heavy construction machinery , and in the 1980s , it was one of major centers of oppositional activities ( see 1988 Polish strikes ) .
 Polish
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Polish