The first “definition” doesn’t fit the group you’re trying to define. If you’re talking about American (using the Us as shorthand)…they are by no means restricted to small business owners, that’s but a small (albeit with outsized power) enclave in the “coalition”. Their policy ideologically empirically opposes the working class. There’s no lefti wing version of the word, or rather, the proper definition is leftist. What you’re describing seems to be an ideological axe you have to grind with Marxism, or socialism something. Actual libertarianism is simply a school of thought - a collection of philosophies - that prioritize individual liberty (freedom). Generally these philosophies aren’t related to American libertarianism/freedom…it’s more of a freedom *from rather than a freedom to* thing…to oversimplify: leftist (real) libertarians believe power structures shouldn’t impede the (not obstructive and lawful) activists of the people - it’s very conscious of power differentials, while American libertarians believe in an absolute right to individual freedom that may or may not conflict with other peoples’ freedoms - after that point of tension it comes down to functional power (thus it’s antithetical to the proper definition).