A year after President Obama's election, hate groups are feeling bolder than they have in over a decade, and their usually insular anger is beginning to spill into the public realm. This weekend, the National Socialist Movement, a neo-Nazi organization, held rallies in Arizona and Minnesota. Those demonstrations came on the heels of similar actions in Southern California, where epithet-spewing white supremacists were forced to disband by rock-throwing counter-protesters. The upsurge in visibility is more than anecdotal—law-enforcement officials are monitoring levels of agitation among extremist groups that they say are the highest since Timothy McVeigh’s deadly attack in Oklahoma City nearly 15 years ago.

The outcries of right-wing tea-partiers, death panellers, birthers, and the like are accompanied by increased activity all along the paranoid fringe.

“It’s sort of a beehive now,” says James Cavanaugh, a special agent with the Bureau of Alcohol, Tobacco, Firearms and Explosives. Cavanaugh was one of the agents at the standoff at David Koresh’s Waco, Texas, compound in 1993 (which McVeigh timed his terrorist act to commemorate, two years later, on April 19, 1995). Last October in Tennessee, Cavanaugh aided in the arrest of two white supremacists charged with plotting to assassinate Obama, and in 2007 he helped bring down members of the Alabama Free Militia, who were found with hundreds of hand- and rifle grenades and other explosives. The arrests had an unsettling familiarity. “We haven’t had that kind of activity since the 1990s,” Cavanaugh says.

“We believe there is a real resurgence,” adds Lieutenant David Hall, director of the Missouri Information Analysis Center, which tracks antigovernment extremist groups around the Midwest. “The atmosphere is ripe.”

Members of the National Socialist Movement, a neo-Nazi group based out of Detroit, were met with a greater number of protesters.

Phoenix police kept the groups apart, as members from both sides shouted insults at each other.

Jeff Schoep, a NSM leader, said his group was standing in defense of America.

J.T Ready of Mesa also spoke at the America First Rally. He said the group was defending his country against invaders.

After about an hour, the neo-Nazis left the capitol to march down Jefferson Avenue before getting into their cars at 12th Avenue.

Andy Hernandez of Phoenix said he was surprised at the different types of people who showed up to protest the neo-Nazis.

"There's all kinds of people, from different races and colors," Hernandez said. "We represent America. We didn't shut them down, but we gave them a counter protest. We just oppose what Nazi represents."

Reporter: Do you consider yourself a National Socialist?

Ready: National Socialist? I am.

Reporter: Weren't Nazis considered National Socialists?

Ready: Well, there's a term that starts with an 'N' for calling black people too, uh, so I think that the 'N' term for National Socialists, calling them Nazis, is the same thing.

So where might another McVeigh—or worse—spring from?

Experts on extremist groups say that the outcries of right-wing tea-partiers, death panellers, birthers, and the like are accompanied by increased activity all along the paranoid fringe—from radical border-patrol groups to skinheads to sovereign citizens. Two camps are particularly restive: militia enthusiasts and white supremacists; their members are seething because of the persistence of two wars and the election of a black (and Democratic) president with an ambitious agenda. The previous upsurge of antigovernment activity in the 1990s—of which McVeigh’s attack marked the apex—was set off in part by a recession and the election of a liberal president.