Mr. Gelbaum began contributing $50,000 or so annually to the A.C.L.U. in the early 1980s and kept increasing his gifts, to $22.5 million in 2008, board members said.
The only condition he placed on the gifts was that he remain anonymous, so only a handful of people at the A.C.L.U. knew he was the donor. ... Mr. Romero did not reveal Mr. Gelbaum’s name, describing him only as ”a donor,” board members said
Still, it is hard to keep secrets with a board of more than 80 members, most of whom report to state affiliates. ”As soon as he started telling us, anyone who had a laptop with them was busy Googling” and figured out who the donor was, a national board member said.
Mr. Romero told the board that the donor had also stopped giving to three ”sister organizations,” a phrase board members said he had used in the past to describe other groups with which the A.C.L.U. has collaborated, like the Sierra Club.
Mr. Gelbaum took a rare turn in the spotlight earlier this decade when environmental activists said he was behind the Sierra Club’s decision to adopt a neutral stance on immigration. Some people believe immigration has aggravated environmental problems.