The socialism quote above and the numerous variations of socialism  operating  around the world, including the United States, illustrate the inexactness of the term itself.  

The Union of Soviet "Socialist" Republics and Germany's 1933 National  "Socialism" and Bernie Sander's 'Democratic Socialism'  all have one thing in common; the word 'socialist'. 

And yet, according to Gallup, a significant number of US voters will not vote for Bernie because he is a 'Socialist'.   And his 'socialism' isn't even close to being as radical as that of FDR.