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Erdman 's Trans-National Communications were the majority owners of the Boston Celtics of the National Basketball Association from 1969 – 71 and the Oakland Seals of the National Hockey League during the 1969-70 NHL season .
 person: Erdman; organization: Boston Celtics; organization: National Basketball Association; organization: Oakland Seals; organization: National Hockey League
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Erdman; organization: Boston Celtics; organization: National Basketball Association; organization: Oakland Seals; organization: National Hockey League