SEATTLE >> The Seattle City Council on Tuesday added caste to the city’s anti-discrimination laws, becoming the first U.S. city to specifically ban caste discrimination.

Calls to outlaw discrimination based on caste, a division of people based on birth or descent, have grown louder among South Asian diaspora communities in the United States. But the movement is getting pushback from some Hindu Americans who argue that such legislation maligns a specific community.

Proponents of the ordinance that was approved by a 6-1 vote Tuesday say caste discrimination crosses national and religious boundaries and that without such laws, those facing caste discrimination in the U.S. will have no protections.

The ordinance is a contentious issue, especially among the nation’s South Asian diaspora. Supporters argue it is needed because caste is not covered under existing civil rights protections. Groups opposing the measure say it will malign a community that is already the target of prejudice.

Council Member Kshama Sawant, a socialist and the only Indian American on the City Council, said the ordinance, which she proposed, does not single out one community, but it accounts for how caste discrimination crosses national and religious boundaries.

Activists on different sides of the issue began arriving in Seattle well ahead of Tuesday’s city council meeting. As early as last week, more than 100 people had put in requests to speak at the meeting. Early Tuesday, several activists braved cold temperatures and wind gusts to line up outside City Hall so they would get a chance to speak to the council before the vote. But the council restricted public comment at the meeting.

The origins of the caste system in India can be traced back 3,000 years as a social hierarchy based on one’s occupation and birth. It is a system that has evolved over the centuries under Muslim and British rule. The suffering of those who are at the bottom of the caste pyramid — known as Dalits — has continued. Caste discrimination has been prohibited in India since 1948, a year after the nation’s independence from British rule.

Dalit activists from Seattle and beyond rallied at Seattle City Hall in support of the ordinance, said Thenmozhi Soundararajan, founder and executive director of California-based Equality Labs.

Over the past three years, several colleges and university systems have moved to prohibit caste discrimination.