Nixon used it against his enemies. It currently targets Tea Party groups and apparently cannot keep conservative tax returns private.
The Internal Revenue Service has too much power over the lives of individuals, businesses, and non-profits. It can interpret laws selectively, subjectively, or not at all depending on who they want to go after.
But there is a simple remedy, one that I have kind of resisted in the past. That is to eliminate revenue based taxation entirely and replace it with consumption taxes. This would take a very specific constitutional amendment that wiped away old taxes and set strict limits on new ones.
Consumption based taxation is much less subjective. It does not require sifting through complicated rules and regulations. The federal government can charge x% on every item purchased. No need for audits or selective enforcement on educational non profits.
It is quite obvious that government cannot be trusted with many of the vast powers that it has assumed. Take the IRS off the list of agencies that can ruin our lives and harass us. Go to consumption based taxation.