The National Organization for Marriage (NOM), the nation's most vociferous opponent of marriage equality, has launched a boycott against Target over its recent endorsement of marriage equality.

The Minnesota-based retailer announced on Tuesday that it has signed on to an amicus brief in support of plaintiffs challenging marriage bans in Wisconsin and Indiana.

The Seventh Circuit Court of Appeals in Chicago will hear oral arguments in Baskin v. Bogan (Indiana) and Wolf v. Walker (Wisconsin) later this month.

“It is our belief that everyone should be treated equally under the law, and that includes rights we believe individuals should have related to marriage,” said Jodee Kozlak, executive vice president and chief human resources officer at Target.

NOM President Brian Brown condemned the brief, calling its language “extremely charged.”

“It calls them 'the states' bans [on same-sex marriage]' and, even more radically, 'marriage discrimination' laws!” Brown wrote.

“Join me in telling Target today that they are out of touch with consumers and they have insulted the millions of Americans who have voted to uphold marriage as the union of a man and a woman – tell them how much we resent being fashioned 'bigots' and 'haters' for doing so!” Brown added. “Target and its peers in the corporate world need to realize that the countless Americans who believe in marriage as the union of a man and a woman will not stand for being insulted and demeaned. The rash of corporate meddling in the politics of marriage and family will only continue if we do not stand up and say enough is enough.”

NOM has previously launched boycotts against Starbucks, General Mills and, most recently, JP Morgan Chase.

(Related: NOM launches JP Morgan Chase boycott over gay ally survey.)