I'm not the person you asked and as an Australian it's difficult for me to find a concrete irrefutable example of the USofA IRS being weilded as a political weapon on short notice.

I can, however, provide two examples of an incredibly unlikely event that happened to two political enemies of the then seated POTUS:

https://www.nytimes.com/2022/07/06/us/politics/comey-mccabe-...

As outlined the Comey | McCabe audits appear to have all the likelihood of jeering at the president and then being struck by lightning.

This does appear to be something specific to a particular POTUS and not a general practice.

I was thinking specifically of the Tea Party targeting during the Obama years.

https://en.wikipedia.org/wiki/IRS_targeting_controversy

The first several paragraphs of that page imply that targeting didn't actually occur, at least not in the way the Tea Party claimed. Both liberal and conservative groups were selected for scrutiny by the IRS. James Comey - a Republican and FBI Director at the time - found no evidence of wrongdoing.