What is the fine-grained topic of the following text: Shapiro has testified before Congress and state legislatures and, as coordinator of Cato’s amicus brief program, filed more than 200 “friend of the court” briefs in the Supreme Court, including one that The Green Bag selected for its “Exemplary Legal Writing” collection. Only return the topic.
Shapiro's legal work and contributions at Cato's amicus brief program