One of America's largest feminist groups has called for NFL Commissioner Roger Goodell to resign.
The National Organisation for Women says the NFL has "a violence-against-women problem" and "the only way to restore honour and integrity to the country's most lucrative and popular pastime" is for Goodell to step down.
NOW says the league should appoint an independent investigator to look into violence against women, sexual assault and stalking.
NFL spokesman Greg Aiello says the league appreciates the concern and it has "already initiated steps with the help of outside experts to strengthen our policies and programs on domestic violence and sexual assault."
The NFL has been questioned for its handling of Baltimore Ravens running back Ray Rice, who was suspended for two games by the league in July for punching his fiancee, then released by his team and suspended indefinitely on Monday only after video of the attack was made public.
Goodell has said the league asked for video of the attack during its investigation but was unable to get it.
According to tax returns, Goodell made more than $US44 million ($A47.6 million) in 2012 and the league's revenues approached $10 billion.
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