"In the name of what, a group can decide over another on what is it allowed to do?"
Of course that a group can decide over another group which is a subset of the former. Otherwise, any city of any country, or any group of individuals, could decide to vote and set their own rules for whatever they want.
Of course that a group can decide over another group which is a subset of the former. Otherwise, any city of any country, or any group of individuals, could decide to vote and set their own rules for whatever they want.