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.
The Palestinians did repeatedly advocate for a unitary secular solution that would give equal rights to everyone. Ben Gurion and the zionist project instead chose partition to setup a causi belli to begin the nakba (Expulsions of Palestinians started in the 1920s, not with the nakba) and establish Israel as a settler Colonialist state.