Hate crimes experts and law enforcement officials are closely watching white supremacists across the country as Barack Obama prepares next week to be sworn in as the first black president of the United States.

So far, there is no known organized effort to express opposition to Obama's rise to the presidency other than a call by the National Knights of the Ku Klux Klan for its members to wear black armbands as well as fly the U.S. flag upside down on Inauguration Day and Obama's first full day in office.

"The level of vitriol, I expect, will go up a bit more around inauguration time," said Brian Levin, director of the Center for the Study of Hate and Extremism at California State University-San Bernardino.