An editorial published in the (reputable) journal Diabetes Care, which they handed out at a diabetes conference. I imagine if it wasn’t critical of the administration they would not have been told to stop, but this is Louisiana so
Diabetes Care isn't just a reputable journal, it is the flagship publication of the American Diabetes Association, the organizers of the conference!
And one of the people kicked out was Steven Kahn, a co-author of the editorial, and editor-in-chief of Diabetes Care.