From the State Department Global Anti-Semitism Report:
For the purposes of this report, anti-Semitism is considered to be hatred toward Jews—individually and as a group—that can be attributed to the Jewish religion and/or ethnicity. An important issue is the distinction between legitimate criticism of policies and practices of the State of Israel, and commentary that assumes an anti-Semitic character. The demonization of Israel, or vilification of Israeli leaders, sometimes through comparisons with Nazi leaders, and through the use of Nazi symbols to caricature them, indicates an anti-Semitic bias rather than a valid criticism of policy concerning a controversial issue.
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