Has anyone had any luck retrieving foreigner police registration files

from Berlin during the 1920's to 1930's?

I know my relatives emigrated to Berlin and likely had to register
with the local police. Does anyone know if the police registration
records have any valuable information?

Thanks,

Rob Weisskirch
Marina, CA

Seeking: WEISSKIRCH, Berlin, Buenos Aires, Nowy Wisnicz; SCHON,
Berlin, Buenos Aires, Nowy Wisnicz; SPIRA, Nowy Wisnicz; FAERMAN,
Mendoza, Kopreshty, Teleneshty, HERZOG, Komjatice, San Juan, Arg.