Provide Them With Employee Counselling.

https://news.sky.com/story/israel-gaza-latest-israel-claims-hamas-weapons-and-signs-of-hostages-found-inside-childrens-hospital-basement-12978800?postid=6762895#liveblog-body

Make them aware that they are providing support to a Foreign Terrorist Organisation. Thus are committing Treason against the United States of America.

If, once they've been made aware of the reality of the situation. They still wish to commit Treason.

Then they're not coming into work tomorrow.

Nor the day after.