This is common knowledge. It is open and public. You can find examples by searching the most obvious of phrases, like Grassley 33rd degree Freemason.

To the downvoters who do not believe this, here is one of many examples to prove it.

We have known of Chuck’s corruption for decades. We know many secrets, but this is no secret. It just may not be what you want to hear.

https://grandlodgeofiowa.org/docs/publications/December_Bulletin_2015.pdf

Grand Cross of Honor Past Grand Treasurer Shane A. Harshbarger received the Scottish Rite Grand Cross of Honor at the 2015 Biennial Session of the Ancient and Accepted Order of the Scottish Rite of the Southern Jurisdiction Supreme Council. The Grand Cross is the highest honor for a 33rd degree Mason. Brother Harshbarger joins Senator Charles Grassley as the only Iowa Masons to currently hold this honor.

Chuck Grassley is controlled opposition and represents the white square on the checkerboard.

What really happened to Senator Paul Wellstone? Chuck knows about the “accident.”