As anti-Wall Street protests spread from New York to other U.S. cities, the activists beginning their third week inside a Lower Manhattan park urged participants to dress up as "corporate zombies" on Monday.

Organizers told the Associated Press that they would hold an anti-police brutality protest on the steps of City Hall, as well as a rally in support of union workers outside Sotheby's auction house on the Upper East Side. New York police arrested hundreds of demonstrators Saturday after a group blocked traffic on the Brooklyn...