Yeah, I remember one restaurant, Man Fook Low, on Alameda Blvd. near 9th
Street in Los Angeles. We went there several times, it never seemed to
be crowded although there were people (waiters? cooks?) chopping up meat
and vegetables.
One Christmas Eve when we a group of us had stayed up very late talking,
I called this restaurant at 2AM and asked if they could seat a party of
12. They said yes, so we drove there (27 miles). We got there, they
seated us in a back room. We agreed on three dishes that should be part
of our meal, and told the waiter to have the cook choose the rest.
We got a very nice meal for a very low price. But how they stayed in
business was a bit of a mystery.
Later on, an acquaintance who worked for LAPD (as a civilian analyst)
told us that Man Fook Low was the center for the "outside of Chinatown"
tong. Which might explain things. I suspect that back room was sometimes
used for Pai Gow.