TRENTON, NJ—Trenton Mayor Tony F. Mack; the mayor’s brother, Ralphiel Mack; and his close associate, Joseph A. “JoJo” Giorgianni, were arrested by federal agents this morning and charged by criminal complaint in connection with a scheme to extort payments of more than $100,000 from others who were purportedly developing a public parking garage, U.S. Attorney Paul J. Fishman announced.