The Human Rights Campaign (HRC) and Freedom to Marry on Tuesday called on Roman Catholic bishops to stop supporting the National Organization for Marriage (NOM), the nation's most vociferous opponent of gay marriage.

In a letter to Cardinal Timothy Dolan, president of the U.S. Conference of Catholic Bishops (USCCB), the groups cited NOM's recently revealed strategy to pit minority groups against gay marriage supporters in their plea.

“Last week, HRC uncovered a series of documents that shed light on the racially and ethnically divisive strategies and tactics used by NOM,” the letter reads.

“The documents reveal that NOM's key goals are to 'drive a wedge between gays and blacks,' and to manipulate Hispanic communities by 'making support for marriage a key badge of Latino identity' and 'to make opposition to gay marriage an identity marker, a badge of youth rebellion to conformist assimilation to the bad side of 'Anglo' culture.' Perhaps most shocking, NOM planned 'to identify the children of gay parents willing to speak on camera,' essentially tricking minors into publicly criticizing their families.”

“It is hard to believe that the Catholic Church hierarchy, which professes to 'promote the greater good which the Church offers humankind,' would continue to funnel funds into, and align itself with, an organization that explicitly uses such toxic tactics to pit American against American, minority against minority, family member against family member.”

“The truth is the great majority of Catholics support the freedom to marry.”

HRC President Joe Solmonese said in a statement that Dolan has the “opportunity to denounce race-baiting and attempts at ethnic division, and in doing so would be representing the views of fair-minded lay Catholics across the country, who overwhelmingly support LGBT equality.”

(Related: Maggie Gallagher defends anti-gay marriage group's race-baiting strategy.)