Well, unions regularly complain that "minimum service decrees" are "abusive". Sometimes they get challenged in court. Also, there would be an argument over which services are "essential to the community" For instance, emergency health workers, or the police. Section 28.1. (on the right to form unions) allows the law to limit or eliminate the Armed Forces' right to uninise, and also allows for "peculiarities" of unionisation of public employees generally.  While searching for the constitution's article I came across a piece of legislation on "minimum services for private security contractors", and I think callin private security (as opposed to the Police) "essential" really is pushing it a bit.

Can the last politician to go out the revolving door please turn the lights off?