Guillermo Loaiza, a loan officer for a unit of J.P. Morgan Chase & Co. in Phoenix, has resigned from the board of Acorn Housing, a spokesman for J.P. Morgan said. Acorn Housing is an affiliate of the community-organizing group Acorn, the full name of which is the Association of Community Organizations for Reform Now. Both Acorn and Acorn Housing have been under fire since the recent release of secretly recorded videos that depicted Acorn employees offering advice on evading taxes, setting up brothels and smuggling illegal immigrants. J.P. Morgan has said it doesn't have a regular working relationship with Acorn...