What is the communist position on the definition of fascism?

As far as relating fascism specifically to the Neoliberalism of the US, here is an insightful comment by @Droplet@hexbear.net:

Fascism is fundamentally characterized by 1) mass privatization and 2) vicious anti-communism.

The fascist counter-revolution first saw its success in 1920 Italy when the post-WWI nationalized economy gave rise to a strong socialist movement that nearly overthrew the bourgeois government.

WWI ended laissez faire capitalism when it found itself unable to ramp up war production and suffered from inefficient output, and this was a disadvantaged position during inter-imperialist warfare. Instead, state run capitalism became the norm as the imperialist powers were dragged into a protracted Great War during which vast resources and war production could only possibly be organized efficiently with state intervention. Such dramatic changes shifted the leverage to the working class, whom the ruling class became dependent on to win the war. The consequence of this was the explosion of labor and socialist movements throughout Europe, and culminated in the Bolshevik Revolution in Russia that subsequently ended WWI.

As they found themselves unable to resist against the tidal wave of workers movement, inspired by the success of the Bolshevik Revolution in Europe, the liberal capitalist class turned to fascism with the hopes that such extreme brutality could crush the seemingly unstoppable socialist movements. They succeeded, first in Italy in 1922, and then subsequently in Germany in the early 1930s.

One of the first signs of a fascist regime was the mass privatization of the previously nationalized industries:

Benito Mussolini became Prime Minister in October 1922. Nazis rose to power in 1933 in Germany. Mussolini convened a meeting of his cabinet and immediately decided to privatize all the public enterprises. On December 3, 1922, they passed a law where they promised to reduce the size and function of the government, reform tax laws and also reduce spending. This was followed by mass privatization. He privatized the post office, railroads, telephone companies, and even the state life insurance companies. Afterward, the two firms that had lobbied the hardest: Assicurazioni Generali (AG) and Adriatica di Sicurtà (AS), became a de-facto oligopoly. They became for-profit enterprises. The premiums increased, and poor people had their coverage removed.

After the trains were privatized, the services became slower and more irregular, contrary to the popular myth.

In January 1923, Mussolini eliminated rent-control laws. His reasoning ought to be familiar since that is the same reasoning used in many contemporary editorials against rent control laws. He claimed rent control laws prevent landlords from building new housing. When tenants protested, he eliminated tenants' unions. As a result, rent prices increased wildly in Rome, and many families became homeless. Some went to live in caves.

Once more, these policies allowed landlords to increase their profit and holdings while they severely hurt the poor.

To remove "government waste," Mussolini removed the federal government from remote areas in Italy. This meant that rural farmers, peasants, and workers no longer had the protection of the federal government against abuse from agribusiness. Instead, they were entirely under the mercy of big businesses.

The austere economic policies in fascist Italy were studied closely by the British marginalists, who were the precursors to the neoclassical economists that eventually found the Chicago school and brought neoliberalism to the forefront of economics.

As such, there is a direct connection where fascism and their austerity economics directly contributed to the development of neoliberalism. Combined with a vicious anti-labor and anti-communist thrust, the models of fascism being replicated in Indonesia in the 1960s, Chile in the 1970s and Russia in the 1990s (Russia being a special case because they didn’t go all the way, as Putin re-nationalized a lot of the key industries since in the early 2000s) under the guise of neoliberalism, during which hundreds of thousands if not millions of communists and left wing activists were brutally murdered.

Within Europe itself, mass privatization began in the UK as early as the 1960s, and began to become part of the European center left/social democratic platforms in the 1970s. Interestingly, most historical account of privatization in Europe conveniently left out the earliest forms of mass privatization that took place under the fascist regimes in Italy and Germany in the 1920s and 1930s.

In other words, neoliberalism is simply fascism rebranded. By all accounts, the neoliberal model of the United States is as close as you can get to fascism - what is missing here is that violence against communists, labor activists, minorities aren’t becoming prevalent yet due to the relatively high living standards of the US being sustained by its foreign imperialist policies.

But don’t let that fool you, just like in the 1920s, they really can turn to fascism in an instant when the situation becomes dire enough to call for it. It took no effort at all in convincing an entire class of liberals in Italy and Germany to support Mussolini and Hitler.