I remember hearing a story about how one engineer had worked for something nefarious (spam? gambling? straight-up malware?) and got hired by a different company

I remember hearing a story about how one engineer had worked for something nefarious (spam? gambling? straight-up malware?) and got hired by a different company. Eventually something triggered on that engineer's account that caused Google to spread a blacklist to everyone's account at the new company. Potentially apocryphal, but it rings true enough that you have no idea what might anger the Google automation.