The reality is that 100% of the groups "targeted" by the IRS, mostly Republican and a few Democratic, were and are obviously, blatantly violating tax law in order to launder political activity through a fake tax-free group, to dodge taxes and hinder accountability. Every one of them was and is guilty. For every election cycle nowadays, thousands of these paper front groups are created for laundering political funds, and most of them are discarded at the end of the cycle. It's the most blatant tax fraud imaginable.
Every US government agency charged with looking into this said as much - no political bias, IRS completely right to do what it did, which is "enforce tax law".
However, political pressure from Republicans and a few Democrats convinced the IRS to back down, which was a sad outcome for people who dislike corruption in their government.
And recently, the Trump government used a lawsuit settlement to funnel a great deal of taxpayer cash to Republican operatives based on a very flimsy claim. That's an excellent method of backdoor embezzlement itself - just have Republican groups sue the government for anything and have the executive branch "settle" their claims for infinite dollars.