Comment Re:Blockable Means of Communication ... (Score 1) 167
The Sci-Fi you're thinking of is probably Flash Crowd by Larry Niven. When a news event came up on the TV, people would teleport in to see it live. With it would come thieves and pickpockets who would prey on the crowd. The story focused on the method of dealing with the thieves - route all the outgoing booths through a Police clearing centre.
Phil.