192679
In 1968 the Prague Spring outbreak of heretical socialism in Czechoslovakia caused the Bulgarian Communist Party ( BCP ) to tighten control over all social organizations , calling for democratic centrism and elimination of unreliable elements from the party .
 Czechoslovakia, Bulgarian Communist Party
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Czechoslovakia, Bulgarian Communist Party