Adi Shamir not permitted to RSA Conference due to lack of visa (opens in new tab)

History repeats itself: https://fas.org/blogs/secrecy/2013/10/shamir/

For added fun, compare comments on the 2013 version with comments on the 2019 version.

The Register article about this discussed on HN here: https://news.ycombinator.com/item?id=19313698