California Charity Trust search shows UNION OF CONCERNED SCIENTISTS as registered using fundraiser / telefunders :
DONOR SERVICES GROUP, LLC
M & R STRATEGIC SERVICES, INC.
OMP, INC.
ARIA COMMUNICATIONS CORPORATION
ref: http://rct.doj.ca.gov/Verification/Web/Detail ... 92-c537fcab2366
https://www.sos.wa.gov/charities/search_detail.aspx?charity_id=4877
Demand placement on their internal do not call lists!
It is a solicitation of funds from the Union of Concerned Scientists, or whoever they hired to raise money for them. If you call back the number, you can speak to a person who will take you off their list.