To add to this, liberalism and neo liberalism aren't on the left of the political spectrum. These political ideologies are fairly solidly right or centre-right
The Progressive Caucus is clearly a wing of the Democratic Party, which is neoliberal. They occasionally challenge the party line, but never successfully. That's what primaries are for.
That said, there are many American progressive movements that are not neoliberal. Just not in power.
Yeah.. I know the term has been basically meaningless for a while, but still.