A Suffolk County grand jury subpoenaed election records for Saltaire on Fire Island yesterday after complaints that some summer residents had voted illegally by casting ballots there and in the communities where they live most of the year, county officials said. Prosecutors declined to comment. But critics of the village government have accused several people of dual voting, including Geraldine A. Ferraro, the former Democratic vice presidential nominee, and her husband, John A. Zaccaro Sr. Voting records bear out those assertions. For decades Ms. Ferraro has voted regularly in her hometown, New York City, but since 2001, she and her...