What Happens to Other Half of Celtic Fouls?

I am new in this country from Romania and am just learning about NBA basketball. It seems there are some very strange rules. Why, may I ask, does the Boston team get called for only half of the fouls it commits? Is this because they are mostly made up of white players? It's obvious that they foul religiously, yet, they are only called about half the time.

I saw that one of their players even got away with punching another player. Isn't that a foul? This seems much like the officiating we used to go up against when we played the Soviet Union in Moscow.


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