A white nationalist group called White Lives Matter, which calls itself an opponent of the Black Lives Matter movement, has been declared a hate group by the Southern Poverty Law Center, an organization that tracks extremist groups in the United States.

“The White Lives Matter website says their movement is dedicated to the preservation of the white race. That tells you all you need to know,” said Heidi Beirich, the director of the Intelligence Project at the Southern Poverty Law Center in Montgomery, Ala. “They’re against integration, immigration. This is standard white supremacist stuff.”

The group, which grew out of a social media meme, argues that white Americans are victims of a genocide caused by factors like the immigration of nonwhite people and marriage between white Christians and nonwhites or Jews, Ms. Beirich said. The law center’s designation is meant to draw attention to and increase scrutiny of the group’s activities.

Last week, its members held a protest outside the Houston office of the National Association for the Advancement of Colored People to demand that it denounce Black Lives Matter, according to video posted online by the group. The Houston Chronicle reported that some of the protesters carried assault rifles and Confederate flags.