how did some webmaster get these private information database?

just like
ssn
phone no.
? Criminal Records
? Property Records
? Bankruptcy, Liens & Judgments


ww*w.criminalrecords.c*om
ww*w.searchbug.c*om/peoplefinder
ww*w.publicpeoplefinder.c*om
if we could got some these databases, can make big bucks...