Perhaps, a good example of core (bookish) ideology of “Socialism” can be found in the traditional French national motto, after the French Revolution (once the monarch was guillotined):
Liberté, égalité, fraternité
(Liberty, equality, fraternity)
Here’s an excellent backgrounder and full explanation by Hayek:
Nazism is Socialism*
http://www.brookesnews.com/091910hayeknazis_print.html
Published in the spring of 1933
*This memorandum may be found in the Hayek Paper, box 105, folder 10, Hoover Institution Archives.