a friend of mine used to work for some non-profit that handed out PB&Js to the unhoused in a large US city with purposely awful homeless services and closed shelters. the cops were always hyper aggressive with unhoused, so most lived outside the central downtown in undeveloped lots of poorly drained fragments called "the woods". but a big chunk still existed downtown, despite laws and signage about the laws against providing material support of any kind to the unhoused. even food.
apparently, when there was an important confab/convention bid tour coming to town, the city police would go around in wagons the nights prior and grab them off the street and warehouse them in some unused, unfinished concrete building with a loading dock and lock them in for a few days. my friend heard about it from multiple of the unhoused, though the wagon windows were darkened and so no one was clear exactly where it was.
this was the early to mid 2000s, so I can't imagine the situation is improved.