Lawyers from plaintiffs powerhouse Robbins Geller Rudman & Dowd in court papers on Friday called out “a cadre of firms responsible for a dramatic explosion of federal deal litigation,” and urged a federal judge in San Francisco to reject a fee request by fellow plaintiffs’ counsel.

It’s a remarkable motion, laying bare tension on the plaintiffs’ side as merger objection filings—many of dubious merit—have skyrocketed in the past two years in federal courts after Delaware Chancery Court judges quit rubber-stamping the settlements.