They have been called Marxist-Lenninist by more mainstream politicians: https://en.wikipedia.org/wiki/%C3%96rebro_Party#2021_bus_rap...
Free dental care is considered "extemely left wing" now? That's just bizarre tbh.
If a country would decide to use tax money to provide health care services for free to everybody that's not much different than using tax money to maintain an infrastructure network that's free to use (like roads), or free police and firefighting services - and I think none of those examples are considered particularly 'left-wing'.
No more bizarre than the idea of free speech being ceded to the right.
Apparently even air conditioning is now a left vs right culture war issue...