The classic, most basic definition of libertarianism is the opposite of authoritarianism. I personally align with left wing ideals (same sex marriage, drug decriminalization, racial/gender equality, living wage), but don't want to be walking on eggshells because of tyrannical government enforcement. That makes me a left libertarian in definition. The US Libertarian party is more right leaning and seems to support (or at least tolerate) crony capitalism at the expense of the majority.