
in history - and it ran without being noticed for nine months. But experts say the SolarWinds hack is unique in its scope, potentially the largest spying operation against the U.S.

Office of Personnel Management, which stored the private information of nearly all government employees, including undercover agents. The campaign has drawn some comparisons to China's 2014 hack of the U.S.

It's not rare for companies or government agencies to suffer security breaches.

Around the world, at least hundreds, but more likely thousands or tens of thousands of organizations - including companies, schools, think tanks and, notably, every major government agency - have been working frantically to see whether they've been affected by the suspected Russian hacking campaign and, if so, how much access the hackers had.
