Lieff Cabraser Heimann & Bernstein and Cowan, DeBaets, Abrahams & Sheppard filed a class action on behalf of lead plaintiff Christopher Farnsworth, author of the “Nathaniel Cade” fiction series, against Meta on Tuesday, claiming that it stole “hundreds of thousands” of copyrighted books from a pirated online collection to build its large language model set, “Llama.”