The Protecting Americans from Tax Hikes (“PATH”) Act of 2015, enacted in December 2015, requires organizations to notify the IRS if they desire to operate under Section 501(c)(4) of the Internal Revenue Code (“Code”).  (Only organizations described in Section 501(c)(3) of the Code are required to apply for and receive recognition of their tax-exempt status; other organizations, such as social welfare organizations described in Section 501(c)(4), may apply to the IRS for recognition of exempt status but are not required to do so in order to be exempt.)