Others have spoken of the natural right that everyone has to preserve what belongs to him, without explaining what they mean by 'belonging'.
Gist of Idea
If we have a natural right to property, what exactly does 'belonging to' mean?
Jean-Jacques Rousseau (Discourse on the Origin of Inequality , Pref)
This is aimed at Locke. What Marxists will challenge is the legitimacy of property ownership, granted by patronage, enclosure, exploitation and conquest. These start as injustices, but that fades after a few generations. Locke has a labour-theory.
Rousseau,Jean-Jacques: 'The Basic Political Writings', ed/tr. Cress,Donald A. [Hackett 1987], p.38