Established on 9th March 1977 as the B’nai B’rith Lodge of Neuilly and West Paris, this Lodge was named after Léon Blum on 18th November 1999.

Its founding object in 1977 was to unite Israelis to promote humanity's higher callings, to raise the moral and intellectual tone amongst fellow Jews, to encourage values such as philanthropy, honour and patriotism, to support science and the arts and to support victims of persecution.
 
Between 1936 and 1947, Léon Blum was Head of the French government. Born in 1872, he is associated with unprecedented social reforms, in particular instituting the 40-hour working week and paid annual leave.

He was a secular Jew, who spoke of his "gratitude and pride for the people I belong to".

He was friend with Haim Weizmann, and a fervent supporter of Zionism. He attended the Zurich Socialist Congress in 1929, representing the French Socialist Party.

Léon Blum died in 1950.