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The first leftist would not be popular in America today. That is true because the original leftists wanted to abolish government controls over industry, trade, and the professions. They wanted wages, prices, and profits to be determined by competition in a free market, and not by government decree. They were pledged to free their economy from government planning, and to remove the government-guaranteed special privileges of guilds, unions, and associations whose members were banded together to use the law to set the price of their labor or capital or product above what it would be in a free market.
The first leftists were a group of newly elected representatives to the National Constituent Assembly at the beginning of the French Revolution in 1789. They were labeled "leftists" merely because they happened to sit on the left side in the French Assembly.
The legislators who sat on the right side were referred to as the party of the Right, or rightists. The rightists or "reactionaries" stood for a highly centralized national government, special laws and privileges for unions and various other groups and classes, government economic monopolies in various necessities of life, and a continuation of government controls over prices, production, and distribution.
https://mises.org/library/what-classical-liberalism
"Classical liberalism" is the term used to designate the ideology advocating private property, an unhampered market economy, the rule of law, constitutional guarantees of freedom of religion and of the press, and international peace based on free trade. Up until around 1900, this ideology was generally known simply as liberalism. The qualifying "classical" is now usually necessary, in English-speaking countries at least (but not, for instance, in France), because liberalism has come to be associated with wide-ranging interferences with private property and the market on behalf of egalitarian goals. This version of liberalism — if such it can still be called — is sometimes designated as "social," or (erroneously) "modern" or the "new," liberalism. Here we shall use liberalism to signify the classical variety.
https://www.britannica.com/topic/neoliberalism
Neoliberalism, ideology and policy model that emphasizes the value of free market competition. Although there is considerable debate as to the defining features of neoliberal thought and practice, it is most commonly associated with laissez-faire economics. In particular, neoliberalism is often characterized in terms of its belief in sustained economic growth as the means to achieve human progress, its confidence in free markets as the most-efficient allocation of resources, its emphasis on minimal state intervention in economic and social affairs, and its commitment to the freedom of trade and capital.