It’s a chilling thought, and one to which secular historians would be unlikely to give much credence.  But it is probable that Marxism, and certain that Fascism, were deeply involved in occult practices.

Take Marx.  In his early teens he was a keen Christian.  Although it cannot be proven that he became involved in a Satanist cult, there was certainly one operating near his home, and his early writings give some indication that he was involved with them.  By the age of eighteen he had already renounced his Christian faith and became filled with hate.  At this time he wrote a drama called ‘Oulanem’ – this name is an inversion of the name ‘Emmanuel’ (God with us – such inversions are common in Satanist practices).  In this drama he pictures a dark abyss designed for the devil and his angels, and into which he himself seeks to draw all mankind.  In ‘The Fiddler’ he wrote

The hellish vapours rise and fill the brain
Till I go mad and my heart is utterly changed
See this sword? The prince of darkness
Sold it to me.

He wrote to his father:-

A curtain had fallen.  My holy of holies was rent asunder and new gods had to be installed.

And in ‘The Pale Maiden’ he wrote

Thus heaven I’ve forfeited,
I know it full well.
My soul once true to God
Is chosen for hell

Engels also began as a Christian.  After he met Marx for the first time, he described him as ‘a monster possessed by thousands of devils.’  Engels himself moved in Satanist circles.  Close to both Marx and Engels, for a while, was Bruno Bauer, a Tubingen professor who lost his chair for heresy.  Bauer himself was probably involved in occult practices.  He wrote,

I deliver lectures here at the university before a large audience.  I don’t recognise myself when I pronounce my blasphemies from the pulpit.  They are so great that these children, whom nobody should offend, have their hair standing on end.  While delivering the blasphemies I remember how I work piously at home writing an apology of the Holy Scriptures and of the Revelation.  In any case, it is a very bad demon that possesse me as soon as I mount the pulpit, and I am so weak that I am compelled to yield to him…My spirit of blasphemy will be satisfied only if I am authorised to preach openly as professor of the atheistic system.

As for Fascism, the links with the occult are even clearer.  Hitler, Hess, Goebbels and Himmler were all involved with occult practices.  In fact, the whole coutry at that time was riddled with psychic currents, astrologers, fortune-tellers and so on.  Christian views, where held at all, were intellectual rather than life-changing.

Michael Green concludes,

It is perhaps a salutary warning to recall that a society so impregnated with the occult was unable to discern the dark influence in the Nazi leadership, at all events in its early days.

Based on Green, I Believe in Satan’s Downfall, 164-166.