Madness. The author of cURL was denied entry by U.S. immigration. If you're not a programmer, you've probably never heard of cURL. However, it's an important tool that underlies much of the infrastructure of the internet, and part of every Unix programmers daily tool belt. It's like banning the guy who invented the tape measure.
https://twitter.com/bagder/status/879198063998513152
https://twitter.com/bagder/status/879198063998513152