Free Men

Publication date:1947
Genre:Science fiction short story
Preceded by:Rocket Ship Galileo
Followed by:On the Slopes of Vesuvius
Wikipedia page

“Free Men” is a science fiction short story by Robert A. Heinlein. It is copyrighted by Heinlein in 1966, but was probably written between 1947 and 1950, judging from the foreword to it in Expanded Universe, which mentions that it was written after “Rocket Ship Galileo.”

Exposition

In the story, America has been invaded and occupied after the “20 Minute War” and “Final Sunday.”