The call came days after 11 JCCs across the country were targeted by similar threats, the fourth such wave in five weeks.
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The vice president wielded a rake and picked up branches during cleanup efforts at Chesed Shel Emeth Cemetery in the St. Louis area.
The celebrated Jewish-American author said academic boycotts against the Jewish state were the result of Benjamin Netanyahu's policy of excluding the country from the Western world.
The 6-foot-high gate, stolen in November 2014, was found last December in a parking lot in Norway following an anonymous tip.
The free application, which asks incoming freshmen questions about their Jewish identity, was launched at the teen group's huge annual convention.