Google, Ebay, Microsoft, Starbucks, Electronic Arts (EA) and Zynga are among the 70 companies, professional organizations and municipalities opposed to the Defense of Marriage Act (DOMA), which bans federal agencies from recognizing the legal marriages of gay and lesbian couples.

The employers filed an amicus brief urging the Ninth Circuit Court of Appeals to find portions of the act unconstitutional in Golinski v. Office of Personnel Management.

“DOMA presents a number of problems for businesses like EA, as it creates regulatory, tax, and discrimination complications for employers, and that's why we're standing against it,” gamemaker Electronic Arts said in a blog post at its website. “The underlying lawsuit impacts all employers no matter how big or small, and no matter the industry, and we encourage other businesses to join these efforts.”

(Related: Electronic Arts thanked for including gay relationships in its games.)

Federal employee Karen Golinski sued the government after her employer refused to extend health-care coverage to her wife. The Office of Personnel Management argued that DOMA blocked such coverage. In February, U.S District Judge Jeffrey S. White found Section 3 of DOMA to be unconstitutional.

House lawyers at the direction of House Speaker John Boehner appealed the ruling.

Earlier this month, the White House asked the Supreme Court to review the case.