Journalist, writer. Tireless activist. One of the first Dreyfusards. Fought against anti-Semitism. Defended the Jews of Romania and Russia. Took a stand for libertarian Zionism.
Author of:
"Anti-Semitism, its history and its causes", "A Judicial error. The truth about the Dreyfus affair", "Against anti-Semitism. History of a controversy", "Jewish nationalism" and " Anti-Semitism and Revolution".