MIAMI — The head coach of the Portland Trail Blazers and a player for the Miami Heat were arrested Thursday along with more than 30 other people in two criminal cases alleging sprawling separate schemes to rake in millions by rigging sports bets and poker games involving Mafia families, authorities said.

Portland coach Chauncey Billups was charged with participating in a conspiracy to fix high-stakes card games in Las Vegas, Miami, Manhattan and the Hamptons that were backed by La Cosa Nostra Crime families. Heat guard Terry Rozier was accused in a second scheme to concoct fraudulent bets by exploiting confidential information about NBA athletes and teams.

The indictments unsealed in New York create a massive cloud for the NBA — which opened its season this week — and show how certain ty

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