THE close-packed shops on Petaling Street (pictured), a dim warren in a Chinese quarter of Kuala Lumpur, Malaysia’s capital, often throng with bargain-hunting tourists. This month its mostly ethnic-Chinese stallholders faced crowds of a different kind. Riot police prevented a mob of redshirted protesters—ethnic Malays with a host of grudges—from marching down the street. They eventually dispersed loiterers with water cannon. One protester was filmed calling a journalist a “Chinese pig”. Some are threatening to return.