How about that: Lefty “public interest” journalism nonprofit ProPublica is guilty of one of the very “sins” it’s been scourging some righties over.

Specifically, a Post exposé reveals that ProPublica gets millions from donors it refuses to name.

Such “non-transparency” was the basis of its recent slams at the likes of Supreme Court Justice Clarence Thomas and legal activist Leonard Leo. 

The nonprofit’s latest financial disclosures reveal $6.3 million in gifts from donors it won’t name over 2020 and 2021.

Per its 2022 documents, almost $10 million in funding came from two donors whose names went undisclosed — accounting for a quarter of the site’s revenues.

The principle here: Demand total transparency from people whose politics you don’t like; keep your mouth shut about your own big-money backers. 

Thereby making it impossible to determine ProPublica’s own conflicts of interest. 

The outfit’s leaders pal around with (and presumably get bucks from) boldface names like Charles Rockefeller, venture capitalist Joy Marcus and other elites. Why don’t these fatcats get the treatment extended to Thomas’ friend Harlan Crow, or the donors who fund Leo’s efforts?

How do we know the mystery donors have no business before the Supreme Court? That ProPublica’s journalism isn’t in service of their interests? 

Indeed, some donors we do know about are working to make society worse, like crime-loving billionaire George Soros. (And now “more political” son Alex Soros is taking over his empire.) 

One ProPublica pal — Lawrence Rand, a former PR bigwig — gave a false name when he spoke with The Post about these issues.

Is that how someone with a squeaky-clean ethical record behaves? 

Rich people have the right to spend their money as they please on their preferred causes, including anonymously.

But it’s damning that ProPublica refuses to live by the transparency gospel it preaches: For all its pretense to be a righteous gadfly, it’s just one more institution weaponized by the big-bucks left.