I first heard this idea articulated in Umberto Eco's article on Ur-Fascism or Eternal Fascism [0,1]. First link is the abridged list. The second is a full feature article.
From Point #8
"by a continuous shifting of rhetorical focus, the enemies are at the same time too strong and too weak"
From Point #8
"by a continuous shifting of rhetorical focus, the enemies are at the same time too strong and too weak"
[0] http://interglacial.com/pub/text/Umberto_Eco_-_Eternal_Fasci... [1] https://www.nybooks.com/articles/1995/06/22/ur-fascism/