It mean LFI is a classic centre-left organisation a few more leftist than the PS (the ones getting assaulted there) it is a fallacy to call it far nor hard-left
Also it was not an LFI parade it was the unions demonstration where politcals parties usually have a stand on the sidewalk.
Asking LFI what the agression was about is part of a broader red-scare campaign. The agressor were (probably) a far-left group but calling it LFI is a conspiracy theorie
Sadly we do not need the russians to fight each other
Even is they are part of the rise of political violence
The Parti Socialiste ruled France a few years they are often pictured as the "traitors party" since they sided with corporate interest. The actual goverment (from pædo apologists to more classic far right) escaped a no confidence vote thanks to them.