This seems to be conflating two completely different phrases that use the word security. Security mindset has nothing at all to do with working for a government agency or being a spy. It's a similar concept to "antifragility" except that you're assuming that bad things don't just happen by chance.
As there has been talk of the necessities of a security mindset for forming an agi research project, I thought it worthwhile to share this so that rationalists have some information about the types of forces that may be at play, if someone decided to form such a group.
I'm just going to be pulling from wikipedia, as I hope it is relatively factual. Lots of searches pull up non-mainstream media, which I do not trust.
From the wiki page on UK undercover policing relationships scandal.
From the wiki page on Project Minaret
From the wiki page on COINTELPRO
There is also snowdonian global surveillance to consider.