The sculptor of "Tilted Arc," a huge steel arc in the middle of a New York public plaza, cannot sue two officials who plan to remove the work, a federal judge has ruled. The 12-foot-high, 112-foot-long wall in lower Manhattan has been controversial ever since artist Richard Serra unveiled it in 1981. When the U.S. General Services Administration announced plans to remove it, Serra filed a $30-million civil suit. But U.S. District Judge Milton Pollack dismissed Serra's suit, saying that "the purported constitutional issues raised by Serra go far beyond clearly established law." Serra has charged that GSA Regional Administrator William J. Diamond and the agency's former acting administrator, Dwight Ink, violated his constitutional rights to free speech and due process when they recommended removal of the sculpture.