If youd like to learn what it is… I wouldnt call this wiki entry a political treatise but it can give you a 60 second definition. (This term is often confusing in the US because the word “libertarian” has hugely different connotations than in the rest of the world.)

https://en.m.wikipedia.org/wiki/Left-libertarianism#:~:text=Left%2Dlibertarianism%2C%20also%20known%20as,to%20political%20and%20social%20theory.