Re:The 'brushing' scam that's behind mystery parcels
by schoen on Wednesday September 09, 2020 @01:39AM
(#24417572)
Probably time, place, and manner regulations for expression in airports.
https://www.lawa.org/news-releases/2002/news-release-5
(very many U.S. airports now have free expression booths requiring a permit, and forbid some kinds of expressive conduct or solicitation elsewhere in the airport, which I think the courts are OK with)
This used to be commonplace in the US, particularly in airports, in the 70s. It's the source of a gag in the movie Airplane (or one of those comedies). I don't know why it faded out.