The National Organization for Marriage (NOM) has reported raising more that $284,000 last year to promote a proposed gay marriage ban in Minnesota, the American Independent reported.

Minnesota voters in November will decide on the constitutional amendment which would define marriage as a heterosexual union.

According to campaign finance reports filed on Wednesday, NOM gave $250,000 to the group Minnesota for Marriage (MFM), the coalition of groups promoting the amendment. NOM, which is a member of Minnesota for Marriage, claimed its contributions came from membership dues and listed zero donors.

The Human Rights Campaign (HRC), the nation's largest gay rights advocate, accused NOM of skirting Minnesota's public disclosure laws.

“NOM has deliberately evaded Minnesota's public disclosure laws,” HRC President Joe Solmonese said in a statement. “We've seen this movie before in plenty of other states. This is part of NOM’s systematic attempt across the country to oppose public disclosure and hide its donors. In Minnesota, they have taken it to a whole new level. We believe that NOM and others may be secretly telling people to contribute to them instead of directly to the campaign so that they can avoid public disclosure. The contrast between seven individuals opposing marriage equality and thousands of pro-equality supporters is quite revealing.”

Minnesota for Marriage on Tuesday reported raising $830,000 in 2011.

Minnesotans United for All Families, the coalition of groups working to defeat the amendment, earlier reported it had raised $1.2 million, mostly in the closing quarter of 2011, from more than 5,100 people.

(Related: Anti-gay marriage NOM loses appeal to keep donors secret.)