At my job, at least (research at a major government contractor) we all have to undergo annual counterintelligence training. And that's for me, the intern who never leaves the country.<p>Among other things in the training is the assertion that multiple employees are currently being targeted for espionage and at least a few employees are most likely working for foreign governments. They also warn about accepting gifts and give examples of "spooky" things, like random strangers befriending workers on foreign travel only to reveal that they know way too much about that person.<p>Training is there in big corporations, maybe not in startups.