The letter seems to be fitting into a pattern of pro-Israel organizations, such as Canary Mission and Betar, targeting critics of Israel’s military actions, as well as supporters of Palestinian self-determination. Betar says it has provided lists of noncitizen protesters to Immigration and Customs Enforcement, the Department of Homeland Security, and other government agencies, recommending deportation.
Yes, it’s the same. If you want to educate yourself about the topic read Israeli historian Ilan Pappe or Palestinian philosopher Mohammed El-Kurd.