He represented the international wing at the 1872 Hague Congress and the mechanics of Verviers at the 1873 Geneva Congress. At the former, Dave read the minority report supporting federative autonomy and voted against anarchist Bakunin's expulsion from the union.
Dave served as a representative for the international wing at both the 1872 Hague Congress and the 1873 Geneva Congress.  At the Hague Congress, he presented a dissenting minority report advocating for federative autonomy and voted against Bakunin's expulsion from the union.