In 1873 Brociner was chosen president of the local committee of the Alliance Israélite Universelle. Together with Leopold Stern of Bucharest, he was delegated in 1876 to represent Rumania at the conference of the Alliance Israélite Universelle for the defense of Jews in the Orient, held under the chairmanship of Adolphe Crémieux at Paris. During the Russo-Turkish War of 1877, Brociner was secretary of the committee for maintaining ambulances on the battlefield; and in April and May of 1878, he accompanied Adolph Stern to Budapest, Vienna, and Berlin to obtain the co-operation of their coreligionists in championing the cause of the Romanian Jews at the Congress of Berlin. In June he was a member of the commission sent to Berlin to furnish the congress of the European powers with information on the Romanian question. In August 1878, along with , American consul-general at Lyons, he represented the Romanian Jews at the second conference of the Alliance Israélite Universelle, held at Paris.