They were not handing an Article, they were handing an opinion piece titled :Misguided Brushes of a Pen Continue to Dismantle and Destroy Biomedical Research in the United States: We Can No Longer Afford Complacency and Fear. We Must All Act Now!

If they wanted to be political in a scientific conference, they could have done so by handing the opinion piece outside the venue at the entrance. Whoever wanted to get into their politics could do it, and whoever wanted to be left alone and be there for the science could do it as well.

It's extremely disrespectful to be pressuring the other people in the conference with their ideology.