Once a Bastion of Free Speech, the A.C.L.U. Faces an Identity Crisis

It was supposed to be the celebration of a grand career, as the American Civil Liberties Union presented a prestigious award to the longtime lawyer David Goldberger. He had argued one of its most famous cases, defending the free speech rights of Nazis in the 1970s to march in Skokie, Ill., home to many Holocaust survivors.

Mr. Goldberger, now 79, adored the A.C.L.U. But at his celebratory luncheon in 2017, he listened to one speaker after another and felt a growing unease.

A law professor argued that the free speech...