Basically it reduces Infamy so you could be less limited by it , In the pictures you can see Before and After. Now it has HFM version for those who want to use both mods.
This is a submod of HFM, which makes infamy smaller when justifying.
So have you ever tried to Conquer Indochina as Japan , but couldn't do it in time ,because of infamy ? Have you ever tried to control Europe as Germany , but couldn't because infamy didn't let you do it in time? Well this mod is for you!
Here is the original Less infamy mod : Moddb.com
Also you dont need HFM mod, this mod has both HFM and less infamy mod.