Why is he described as a "libertarian socialist"? That is a contradiction in terms! - Anon 24.44.151.58 

 :  Not according to the libertarian socialists.  That Proudhon is generally considered a socialist is well documented, that his beliefs are consistent with libertarianism is plain and also documented.  The article had previously only refered to him as a socialist, like most historical texts do, but libertarian socialist is more accurate.