I had to guess about the "left" part; I assumed it was political, but I looked it up anyway.
Chinpira is a yakuza term, I don't know how much it has filtered into regular conversation; "tea talk" is about as far removed from everyday colloquial speech as one can get, and I am always being chided for my being too formal :-)
It means leftist thugs.
Chinpira are the dirtballs that do all the crime for yakuza, but aren’t good enough to join the family.