At a recent luncheon at Cipriani in Midtown Manhattan, a top lawyer for Citadel delivered a message to leaders of some of the country’s biggest law firms. Brooke Cucinella told them that the hedge-fund company likes to work with law firms that aren’t afraid of a fight.

Cucinella, head of litigation and regulatory inquiries at the business headed by Republican megadonor Ken Griffin, made no mention of politics. But some of the lawyers in attendance took her remarks as reference to a controversy that has been roiling the legal industry.