The Portland Oregonian has a long and storied history of growing vegetables, rather than actually informing folks. One of their latest exposes has to do with underground Portland, which they publish as "Shanghaiing History". Just one little set of problems. The tunnels under Portland, like those in Chicago and elsewhere, were designed to transfer freight from ships expeditiously. They weren't built as a way to transport unconscious men onto ships to be used as slave labor.
After the tunnels in Portland fell into disfavor as a means of transport of freight, they were employed by the then-disfavored Chinese. They were a way to get from one place to another without encountering unpleasantries at street level. And of course, subsections became used for gambling, opium, and other vices.
If you look at The Oregonian "expose", you'll note that there are, in one shot series, numerous chairs. Why would chairs be set up in a tunnel system dedicated to snagging drunks and forcing them onto ships? Perhaps the Shanghaiing folks forced them all to play a game of "Hearts" along the way.
Or perhaps The Oregonian has predictably got the story wrong.