Interesting that Anarchism is largely ignored despite it playing a crucial role in the 20th century as well as being to diametrically opposed to all of Fascism, Capitalism and Soviet Lennism/Stalinism. For those unaware, Gandhi's philosophy was largely based on Leo Tolstoy's Pacifist-Anarchism, and Gandhi subsequently served as a major influence to both MLK and Nelson Mandela. That 3 of the most positively viewed figures of the 20th century, as well as people like Bertrand Russell and George Orwell were all influenced by an idea that most people have never heard of is fascinating.

Anarchism itself is so broad and varied that it resists characterisation. You have the entire spectrum, from primitivists to pacifists to futurists. People who claim that voting in elections is pointless(like many on the Occupy movement) to people who advocate for the lesser evil(Noam Chomsky 'endorsing' Hillary Clinton) to people who advocate for the worse evil(accelerationists)

The one thing that can be said about it with certainty, is that it is seen as "a tendency in human affairs, to question existing power structures". Whether that be the state, religion or interpersonal power relations between race or gender. Much of what we define as "progress" is in reality questioning deep-seated assumptions that seem so obvious that only a fool would question them. In the past, some of these assumptions were things like "It is obvious there are significant difference between races", "It is obvious that men and women are not intellectually equal", "It is obvious that we need a monarch or ruling class to maintain peace and order". Today it is things like "It is obvious that corporations are here to stay and beneficial" or "It is obvious that we need a centralised government to keep order".

One of major problems with society today is that people are essentially told there are 2 positions:

1)You think on balance Government is worse and bloated, and therefore steps should be taken to reduce government influence and increasing private control of resources.

2)You think on balance corporations are worse, and therefore steps should be taken to reduce corporate influence by increasing government control of resources.

Most Anarchists contend that Government and Corporations are undesirable, and that we must work towards some kind of decentralized, federated, non-hierarchical system with free association.

I think in general people need to think more about Libertarian Socialism(https://en.wikipedia.org/wiki/Libertarian_socialism) as a viable alternative to the US/Soviet model, which are more alike than different, as they are both in essence state-capitalist systems. They aren't identical, but fall in a pretty narrow spectrum and incentivise power-seeking. An approach that questions everything on the other hand is the essence of anarchism: a first-principles based method of determining the structure of society.