Boruch Ber Leibowitz | Yisrael Borochov | Ber. | ber | Perón's unconventional bid for new elections was made possible partly by the initial success of José Ber Gelbard | Jeanne Le Ber | Avrom Ber Gotlober |
Contemporaneously with his educational work, Ostrovsky was active in the Zionist Movement's labor organization, Poale Zion, with the leaders David Ben-Gurion, Ber Borochov and Yitzhak Ben-Zvi.