143878
His first works were contrary to the views of the established classical ballet school and he immediately found himself in conflict with the Soviet party and ballet officials and experts , in particular with Agrippina Vaganova .
 Agrippina Vaganova
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Agrippina Vaganova