Aggressive lawyering at two of New Jersey’s high-profile litigation firms — Sills Cummis & Gross and Nagel Rice — is under attack in cases the state Supreme Court has added to its agenda for the term that begins Sept. 14.

A case in which Sills Cummis of Newark, N.J., is facing sanctions and disqualification gives the court an opportunity to make significant refinements in the law governing companies’ control over employees’ electronic communications.