By Dan Ivers, NJ Advance Media for NJ.com
NEWARK – In 1971, a young Joseph Del Grosso spent three months in the Essex County Jail.
Though he had only been hired as a teacher at Franklin Avenue School a year earlier, he was among nearly two hundred school employees jailed over the bitter work stoppage.
Friends and colleagues said it among the first displays of the strength and spirit that would lead Del Grosso, who died Wednesday after years of poor health, to a 20-year stint leading the Newark Teachers Union.
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