If you are studying at an english university, or work at a place where english is the common language, then yes. Do they have the legal right to tell you to speak english on your own time, no.
I've never heard of that. But, do you really want to risk your livelihood to challenge it?
yes and they do it a lot thanks to Republicans who have passed laws favoring bosses and against workers its the new slavery
If the boss or the teacher can't speak their language then they can find out the door works well both ways.
Yes as far as business goes, I believe the courts have ruled that when you represent a business they can dictate what language you speak, who you dress, etc.,. I do not believe the courts have litigated the issue as to schools.
In the movies whistle blowers are paraded as heroes, but in reality they get stomped on. Even the ones that win like Karen Silkwood tend to end up dead or losing everything. That's why people can get away with such things, because Americans don't give a dam unless it hits home for them personally.
If you're in America and have a command of the english language, why not speak it? If your employer and other employees speak english and you don't and can it makes it seem like you have some thing to hide and are talking behind their backs. It's common courtesy law or not.
Language can be a requirement of any employment contract but usually as a function of the language of business.
I think if anything there asking u to do it for respect for all they know ur bad talking them... They don't understand what ur saying how would you fell if someone was talking around u at work or school and u didn't understand them... Its all up to u its your right as a person to speak in your launge though.
depends ,in some cases yes. My old employer specified English speaking only in the contract for safeguarding purposes.
Not in the USA, since there is no official language. But in the UK there is.
Where is here?