'can find different venues in another city where they will be welcomed'
America has become #1 in travel hassle, its a big problem now!
Dear organizers, why not host your next Conference elsewhere?
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https://www.theregister.co.uk/2018/08/23/woman_iphone_border_patrol/
https://www.theregister.co.uk/2018/03/30/us_government_travelers_social_media/
https://www.theregister.co.uk/2017/09/13/us_government_sued_by_travelers/