It's amazing more people don't recognize this and judging from some posts in this thread as a solution they will support oligarch backed alt-right like that will fix the problem.
Liberals are not leftists ffs. S&D are liberals, if you go to the wiki page you can see that they are labeled centre-left. Centre-left in this case stands for left wing of liberalism.
This is an example of party which can be called leftist. It's actually even listed as that on wiki. Minimal condition in general is to be anti-capitalistic.
Our world in data is neoliberal think tank supported by billionares. They got bad reputation of misrepresenting data to favor capitalism as inherently progressive.