User blog comment:KennyChief/S.H.I.E.L.D. - America's SS?/@comment-2041242-20160117213016

Biggest difference is well, SS was used to keep in control of a part of Europe (The german reich and all the nations they attacked and "owned"). They were also used to get rid of the jews and other kind of people that were "less".

SHIELD is not used for either of those two. They were not used to keep controle of the USA. They were used for many things, but not as an enforcer like that.