Millions of immigrants seeking a better life came to New York City in the nineteenth and twentieth centuries. Ronald H. Bayor's study details how the relative tranquility among the city's four major ethnic groups was disturbed by economic depression, political divisions arising out of ties with the Old Country, and factional strife stirred up by local politicians seeking ethnic votes. Also evaluated are the effects of such emotional and political issues such as Nazism and Fascism upon the allegiances of Germans and Italians; the rift in the ethnic community caused by the communist scare; and...