This month marks the 150th anniversary of the Brussels Congress of the International Workingmen’s Association (the so-called first international). It was one of the most important congresses of the International. The majority of the Belgian members hosting the Congress had been developing a libertarian socialist approach that presaged anarcho-syndicalism. One of their more eloquent speakers was César De Paepe, who had been influenced by Belgian and French socialists, including Proudhon, whose “anarchy” De Paepe had extolled in 1863 (see Shawn Wilbur’s full translation here). At the International’s Laussane Congress in 1867, De Paepe had used Proudhon’s own arguments about property to convince Proudhon’s “mutualist” followers in the International to support the collectivization of land in addition to the collectivization of larger enterprises like mines and railways. The issue remained undecided until the Brussels Congress the following year, when a majority of delegates voted in favour of the collectivization of land as well as of industry. This position became known as “collectivism,” which was contrasted with mutualism and, later, libertarian or anarchist communism. Here I present Shawn Wilbur’s translation of an article published by De Paepe in 1869 after the Basle Congress setting forth the arguments for collectivism that he made in the International. I review these debates in more detail in my book, ‘We Do Not Fear Anarchy – We Invoke It’: The First International and the Origins of the Anarchist Movement.