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NHL banning 'cause-based' jerseys next season | CBC
(www.cbc.ca)
Rules
List of Team-Specific Communities:
Metropolitan Division
Atlantic Division
Central Division
Pacific Division
That's why. Too much politics in showing support to any minority group. (And if someone says a team could show up with a swastika -- firstly, okay I'd like to see that and secondly, they could just ban hate-messaging.)