Freeze your credit reports:
Hackers may have stolen the Social Security numbers of every American. How to protect yourself (via LA Times)
"The breach, which includes Social Security numbers and other sensitive data, could power a raft of identity theft, fraud and other crimes, said Teresa Murray, consumer watchdog director for the U.S. Public Information Research Group."
https://www.henryherald.com/tribune/...e2093ad1a.html
In addition to freezing credit reports:
IRS: Get An Identity Protection PIN (IP PIN)
https://www.irs.gov/identity-theft-f...protection-pin