"When you talk about Jews and baseball, what do people say?" asked Rabbi Rebecca Alpert at the Germantown Jewish Centre Sunday morning. "Hank Greenberg and Sandy Koufax." But in Alpert's view there is considerably more to be said about the subject, for instance, the relationship between Jews and African Americans in the black baseball leagues of the first half of the 20th Century. Alpert, a professor of religion at Temple, wrote the book, Out of Left Field: Jews and Black Baseball.