The issue focused on regulations governing pollution controls at plants across the nation that operate coal plants and export liquid petroleum gases (LPG). But according to experts at government watchdog Citizens for Responsibility and Ethics in Washington (CREW), federal prosecutors filed charges against attorneys representing BP after lawyers representing BP lawyers illegally intervened in litigation involving BP's crude oil spill and litigation concerning litigation concerning BP's offshore drilling operation in the Gulf of Mexico. The probe centered on BP's litigation involving litigation concerning BP's offshore drilling operation in the Gulf of Mexico