They're new. ISRA insists that it hasn't provided its membership list to marketers, but instead sends the emails on their behalf.
ISRA has also said that the spam is supposed to be sent from "sponsors@isra.org" (because people complained that spam was sent from "alerts@isra.org," the previously regular address) and that regular announcements are still supposed to be sent from "alerts@isra.org," but apparently ISRA's email software can't handle more than one from-address, so now everything comes from "sponsors@isra.org" instead.