Between 1935 and 1945 he was a close aide of Henrietta Szold managing the Youth Aliyah, and from 1945 until his death in 1947 he was the leader of the organization in Palestine.

The Beyths were a well established Jewish family in the small town of Bleicherode in Prussia (today Thuringia), where they had helped to build up the local textile industry.

After 1933, he became a key member of the "Jüdische Jugendhilfe" (founded by Recha Freier in Germany as the core of Youth Aliyah).

In Palestine Beyth first worked as the representative for Germany in the Youth Aliyah, initially he was hired to organize accounting of the organisation as an experienced German banker.

[6][7] In 1954 Albert Einstein suggested awarding the Nobel Peace Prize to Youth Aliyah and its founder Recha Freier.