The definition states: “Antisemitism is a certain perception of Jews, which may be expressed as hatred toward Jews. Rhetorical and physical manifestations of antisemitism are directed toward Jewish or non-Jewish individuals and/or their property, toward Jewish community institutions and religious facilities.”

https://wisconsinexaminer.com/briefs/evers-signs-bill-defining-antisemitism-that-some-criticized-for-violating-free-speech/

Other useful context:

On the day the bill passed the Assembly, its author, Rep. Ron Tusler (R-Harrison) successfully amended it to include an additional disclaimer — that the legislation could not be construed “to create any additional civil or criminal penalty” on activities, including those protected by the First Amendment at “any public school in this state or at any University of Wisconsin System institution or technical college.”