I only hear "radical left" from those I consider "radical right". For myself and most of my RL friends, "liberal" just means we believe that the government should protect and enable the "little guys" - eg, most of the population to the exclusion of the wealthy. That includes a national health insurance, income equality, generous pandemic relief, etc, over Defense.
"Radical left" in US political terms is "mainstream centre-right" in most industrialised countries.
Back when I was a student in the 1970s, I had a white South African friend there who had been active in Helen Suzman's
Progressive Party, and was an equally active member of our university Conservative Association when I knew him.
I well remember him explaining to me that "If you want to know how fucked up my country's politics are, remember that someone like me, to the right of Margaret Thatcher [she had just been elected as party leader for the first time], has to call himself a 'progressive' and
BOSS think I'm a dangerous communist. If they think I'm progressive, imagine what our conservatives are like!"
Over the last few years in particular, the US has sometimes reminded me of that conversation a lot.