After some quick googling I can't find any groups that support that.
I did find a poll that shows 64% of Americans support creating some path for undocumented immigrants to get legal status. I'm not sure you could call 64% a far left position though.
They don't "support unlimited immigration", they reject the legitimacy of national borders and of immigration as a concept.
For example here's the DSA explaining their view that the national border and immigration statuses are capitalist and imperialist tools to divide the working class: https://www.dsausa.org/blog/fighting-the-security-state-at-t...
I'm still not sure that's representative of the far left. Like I said, the more right wing libertarian position is probably the same, though for different reasons.
That this is being memory-holed, much like the ill-conceived bilingual education initiatives of the 90s, is actually a good sign, as it's proof that we're winning.