LOS ANGELES – Immigrants Without Borders is an Arizona-based assistance organization. It doesn't have the multimillion-dollar funding of national Latino organizations, nor does it have their fame. But this regional group has something the others don't: the ability to mobilize immigrants, to organize marches like the ones seen in the past few months and a long list of community contacts. Bringing these two sides together and the development of a long-term social and economic strategy for Latinos are among the goals of the National Latino Congress. Some 1,300 leaders and activists from across the nation are attending the event, which...