It definitely was, this was written by Heinlein over the course of like two weeks as an angry response to the US suspending nuclear weapon testing. Mind you this was still in the 50’s and right in the middle of the red scare.

Heinlein was a rampant libertarian, and as we’ve seen with the GOP libertarians are not too far removed from fascism. I think Heinlein kinda cooled his heels over time, and mellowed later in his career.