The UN Universal Declaration of Human Rights includes a declaration of the right to private property under Article 17:
"1. Everyone has the right to own property alone as well as in association with others.
2. No one shall be arbitrarily deprived of his property."
Ironically, it also contains the following under Article 4:
"No one shall be held in slavery or servitude; slavery and the slave trade shall be prohibited in all their forms."
The problem, here, is that one person's right to private property typically deprives everyone else of their ability to enter into a contract for their labour freely. Work is compulsory in any society where private property exists. Compulsory work is a natural conclusion of the ideology, so...
Who's going to tell them?