To the hundreds of people a day asking “is it's legal” for a company to do something to you that you don't like, understand that its against reddiquite to ask where you live, or where you work.
I am not going to suggest that you include where you live in your posts, but I do suggest looking up the country where you live, the provice or state that you live, and the city where you live with the appendage “Labor Laws”.
If you still need help, providing information is a more helpful way to come to a productive conclusion than asking if the specific labor laws in a location not provided are legal for your undisclosed position.