The Occupy Wall Street demonstration, a loose-knit populist campaign that began 3 weeks ago in New York City's financial district, has spread to dozens of cities across the country.  Protesters are camped out near L.A.'s City Hall, have assembled at the Federal Reserve Bank in Chicago, and are marching through downtown Boston.  They've adopted the common theme, protesting against corporate greed, unemployment and the role of financial institutions in the economic crisis. The Occupy Wall Street campaign, as the prototype in New York is called, has clearly tapped into a deep vein of anger.  With little central planning, various groups have utilized Facebook, Twitter and Google to coordinate protest strategies.  The protests have attracted longtime crusaders against globalization, professional anarchists, and younger people who are frustrated by poor job prospects. Attention Grabbing Events. Recent arrests of hundreds in New York - near Wall Street and on the Brooklyn Bridge, has energized the campaign and drawn supporters this week in far away cities.  New rallies and, in some cases urban encampments, are being planned for Memphis, TN;  Hilo, HI;  Minneapolis, MN;  Baltimore, MD;  and McAllen, TX, according to Occupy Together, an unofficial hub for the protests that lists dozens of coming demonstrations.  Protests also are being launched in Europe and Japan. New and old protesters in New York City, where the movement started, are showing remarkable commitment and patience.  For the most part, they've remained nonviolent in the face of aggressive actions by the New York police. But if the movement is to have lasting impact, it will have to develop leaders and clear demands.  It also will have to prepare its "troops" for cold and inclement weather, as summer moves into the fall.   [NYTimes, 10/3/11]