LOS ANGELES — The auto insurance fraud unit of the Los Angeles County district attorney’s office has scooped up hundreds of small fish since it opened for business in 1993. But the alleged big ones — the lawyers presumed to be central in the fraud schemes — have been harder to catch.

That could change soon. Two acting lawyers and two former lawyers are due in Los Angeles Superior Court this month in two separate cases alleging that they were the key players in staged-accident conspiracies.