Is telling Mexican-Americans they can not speak spanish at work against the law??

My husband’s work has made it their policy that no one can speak spanish at work. The manager was asking all of the english speakers if they were annoyed by the spanish speakers. Today they handed out a policy letter to all employees not to speak spanish.
Do they have a legal right to do that or is it going against freedom of speech and it is discrimination??
There were no customers around- they work in a warehouse.

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