Jacob Benjamin Salutsky, also known by the alias as J.B.S. Hardman, was a Russian political activist, radical journalist and trade union functionary. Hardman was a proponent of radicalism as a Marxist thinker and a leader of the Jewish Socialist Federation of the Socialist Party of America (SPA). A brief stint in the American Communist movement ended in his expulsion in 1923.

David Petrovsky (Lipetz) (also known as Max Goldfarb, Bennett, Humboldt, Brown, September 24, 1886, Berdychiv, Russian Empire — September 10, 1937, Moscow, Soviet Union) was a Jewish revolutionary politician, economist, journalist, general of the Red Army, and Soviet statesman. He was an active member of the Jewish Bund in the Russian Empire and the Jewish Socialist Federation in the USA. In 1912 he received a Ph.D. in economics from the Free University of Brussels where he studied under Emile Vandervelde. He moved to New York in 1913 where served as the editor of the Jewish Daily Forward newspaper in New York until 1917. In 1917 Petrovsky ran the Russian Constituent Assembly and returned to Ukraine. He was elected a member of the Central Council of Ukraine, its Central Executive Committee (Mala Rada), where he voted for the separation of Ukraine from Russia. He also served as a mayor of Berdichev, a city with the largest Jewish population in the Russian Empire and Ukraine. As a mayor, he managed to prevent planned large Jewish pogroms in the city between 1917-1919. Petrovsky joined the Red Army in 1919 and eventually became a General of the Red Army where he was responsible for all military education in the Soviet Union. General Petrovsky led the Directorate of Military Education in the Red Army from 1919 to 1924 and co-founded the Governmental Committee for the Fight against Antisemitism in Russia and the Soviet Union. Petrovsky was a member of the Presidium of the Executive Committee of the Communist International from 1924 to 1929 where he was responsible for the formation of communist parties in Great Britain and France. From 1929 to 1937 Petrovsky served as a member of the Presidium of the Supreme Soviet of the National Economy in the Soviet Union. From 1929 to 1937 he headed the General Directorate of Higher and Secondary Technical Education in the Soviet Union where he was responsible for the creation of several hundred universities and technical schools across the Soviet Union that prepared engineers and technical personnel in the accelerated push for the industrialization of the Soviet Union. Petrovsky was arrested and executed during Stalin’s Great Purge in 1937 in Moscow. He was posthumously rehabilitated in the Soviet Union in 1958 as a victim of political repression.