What ideology is characterized as a collectivist, extreme left-wing political movement?

The ideology characterized as a collectivist, extreme left-wing political movement is communism. Communism advocates for the abolition of private ownership of the means of production, promoting a classless society where goods and services are shared collectively among the people. In this system, the government typically plays a central role in the economy, with the intention of redistributing resources to eliminate social inequalities. This focus on collective ownership and the pursuit of equality distinguishes communism from other political ideologies.

In contrast, fascism represents a far-right approach that emphasizes strong, centralized authority and nationalism, often suppressing dissent and controlling individual rights to promote the state's power. Socialism, while also advocating for collective ownership, tends to operate within a democratic framework and may allow for some degree of private enterprise. Libertarianism fundamentally prioritizes individual liberty and minimal government intervention, which is antithetical to the collectivist principles of communism. Thus, the defining features of communism as an extreme leftist movement make it the correct answer in this context.