IRS Exempt Organizations group has sent out more than 1,300 questionnaires to self-declared Section 501(c)(4) social welfare organizations; 501(c)(5) labor, agricultural or horticultural organizations; or 501(c)(6) business leagues.  The questionnaires are part of IRS efforts to increase voluntary compliance, learn more about self-declared exempt organizations, and determine whether self-declared exempt organizations are complying with applicable tax-exempt law.  The questionnaires are directed to organizations that are not recognized by the IRS as tax-exempt, but claim exemption under Section 501(c)(4), (5) or (6) and filed a Form 990 for tax years beginning in 2010 or 2011.  Unlike most Section 501(c)(3) organizations, these types of exempt organizations are not required to apply to the IRS for recognition of exemption.