He co-founded in Zagreb, in 1919, together with Aleksandar Licht and other Zionists the "Union of the Jewish confessional municipalities in the Kingdom of SHS" (Savez jevrejskih vjeroispovjednih općina u Kraljevini SHS), later known as "Federation of Jewish confessional communities of Yugoslavia" (Savez jevrejskih vjeroispovjednih općina Jugoslavije - SJVOJ).

Spitzer election induced the rebellion among the Jews from the Jewish communities Sarajevo and Belgrade who favored their own nominee, the Sarajevo-born Mihael Levi.

[1][2][3] In 1937 Spitzer protested at the office of Žika Simonović, Minister of Justice in the Kingdom of Yugoslavia, against the antisemitic articles in the newspapers such as: "Balkan", "Mlada Hrvatska", "Erwache" and "Sturm".

During the 1930s Spitzer and other notable members of the Jewish community Zagreb helped the refugee Jews from Austria and Nazi Germany.

After the outbreak of World War II Jews from the Nazi Germany were strictly forbidden to directly immigrate into Mandatory Palestine.