This is the first in a Daily Caller investigative series.The politically aggressive Service Employees International Union (SEIU) has quietly created a national network of at least eight community-organizing groups, some of which function alongside the Occupy Wall Street movement, a Daily Caller investigation shows.Incorporated by the SEIU as local non-profits, the groups are waging concerted local political campaigns to publicly attack conservative political figures, banks, energy companies and other corporations.Each local group has portrayed itself as an independent community organization not tied to any special interest. But they were founded, incorporated, and led by SEIU personnel.The individual activist groups use...