« the French language police of Québec » = the institution who defines the institutionnal use of the official language in the state, like all countries in the world do. France have almost the same laws as Law 101.
... and forcing everyone to put up signs in French [1]. Compelled speech, if you will.
[1] https://en.wikipedia.org/wiki/Office_qu%C3%A9b%C3%A9cois_de_...