 NEW YORK--BUSINESS WIRE--Halper Sadeh LLP, a global investor rights law firm, is investigating whether Protective Insurance Corporation NASDAQ: PTVCB and its board of directors violated the federal securities laws andor breached their fiduciary duties to shareholders in connection with the proposed sale of Protective to The Progressive Corporation. Under the terms of the merger agreement, Protective shareholders will receive 23.30 in cash for each share of Protective Class A and Class B c 