Full Idea
Arendt claims that modern totalitarianism's primary condition is an atomised mass society: isolated individuals who have no strong ties to communities and who are indifferent to shared political goals.
Gist of Idea
Modern totalitarianism results from lack of social ties or shared goals
Source
report of Hannah Arendt (The Origins of Totalitarianism [1968]) by Johanna Oksala - Political Philosophy: all that matters Ch.9
A Reaction
I think the lack of ties simply describes large modern cities. Not sure about the lack of shared goals. Hitler and Stalin rode on the back of apparent shared goals. Working classes strike me as sharing more goals than middle classes.
Book Reference
Oksala,Johanna: 'Political Philosophy' [Hodder and Stoughton 2013], p.113