Question

A recent investigation into the unfair process of reviewing tax exemptions within the IRS by groups called Patriots would fall under

Answer 1

it would fall under oversee the operations of various agencies in the executive branch.
Overseeing operations that became the task of IRS will include the screening of financial reporting made by that groups. This will include things such as how they determine the value of their assets, the method of recording transactions, how they make their tax exemptions, etc