Justin Mohn, a 32-year-old Pennsylvania man, is in police custody after allegedly murdering and decapitating his father, claiming the latter was a “federal employee” and a “traitor.” Before his arrest, Mohn posted a 14-minute video to YouTube in which he displayed his father’s severed head, proclaiming: "This is the head of Mike Mohn, a federal
I’m not saying that the person who said this isn’t nuts but, as a point of interest , they did use “fifth column” appropriately.
https://en.wikipedia.org/wiki/Fifth_column
Yes except I would argue that while he believes immigrant are the fifth column, the actual fifth column is this guy.