baldober, n. — Green’s Dictionary of Slang

baldober n.

also baldover, baldower

[Ger. Und., ult. Heb. baal, a master + dovor, a word]

(UK Und.) a boss, a leader, a spokesman.

1889–90		Barrère & Leland Dict. of Sl., Jargon and Cant.
1890–1904		Farmer & Henley Sl. and Its Analogues.
1996		(con. 19C) M.A. Meyer et al. German-Jewish Hist. 249: There is also evidence attesting to the cooperation of Jewish gangs with settled agents (wire pullers, called Baldober, from Hebr. ba’al ha-davar).