The US and global partners dismantle the 911 S5 proxy botnet, "likely the world's largest botnet ever" affecting 19M+ unique IPs, and arrest its administrator (Sergiu Gatlan/BleepingComputer)
https://www.bleepingcomputer.com/news/security/us-dismantles-911-s5-residential-proxy-botnet-used-for-cyberattacks-arrests-admin/
http://www.techmeme.com/240529/p23#a240529p23