Must be allowed to speak Spanish?

Which amendment is that, I wonder?

"Members of several civil rights groups are protesting in front of a Taos hotel where Hispanic employees have clashed with the new owner. Whitten Inn owner Larry Whitten forbade employees to speak Spanish and ordered some to Anglicize their Hispanic names when he started making changes at the hotel in July. Taos officials and organizers say the number of protesters on Saturday ranged from 60 to 75.”

Source

It seems to me that a private employer is entitled to run his business in any legal way he wants. If people don't like his conditions of employment, they don't have to work for him.

Posted by John Ray (M.A.; Ph.D.).