268615
Past enlargement has brought membership from six to twenty-seven members since the foundation of the European Union ( EU ) as the European Coal and Steel Community by the Inner Six in 1952 .
 membership, European Union, EU, European Coal and Steel Community
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 membership, European Union, EU, European Coal and Steel Community