Here is the pertinent info from the link.
013The State of New York recognizes the marriage of New York residentsEdith Windsor and Thea Spyer, who wed in Ontario, Canada, in2007. When Spyer died in 2009, she left her entire estate to Windsor.Windsor sought to claim the federal estate tax exemption for surviv-ing spouses, but was barred from doing so by §3 of the federal De-fense of Marriage Act (DOMA), which amended the Dictionary Act—alaw providing rules of construction for over 1,000 federal laws andthe whole realm of federal regulations—to define “marriage” and“spouse” as excluding same-sex partners. Windsor paid $363,053 inestate taxes and sought a refund, which the Internal Revenue Servicedenied. Windsor brought this refund suit, contending that DOMA vi-olates the principles of equal protection incorporated in the Fifth Amendment. While the suit was pending, the Attorney General noti-fied the Speaker of the House of Representatives that the Depart-ment of Justice would no longer defend §3’s constitutionality. In re-sponse, the Bipartisan Legal Advisory Group (BLAG) of the House of Representatives voted to intervene in the litigation to defend §3’sconstitutionality. The District Court permitted the intervention. Onthe merits, the court ruled against the United States, finding §3 un-constitutional and ordering the Treasury to refund Windsor’s taxwith interest. The Second Circuit affirmed. The United States hasnot complied with the judgment.
Held
:1. This Court has jurisdiction to consider the merits of the case
