2) KKK may be "monitored", but they are allowed to speak, demonstrate, organize, and so forth as long as they commit no actual crimes (arson etc).
In the US the KKK is really close to the government. They, and other right wing advocates of violence, get away with a lot of stuff that would end up in big trouble for non-right wingers.
For example, the incoming House Whip, Steve Scalise, gave a well received speech to a white nationalist group in 2002
(Reuters) - U.S. House Majority Whip Steve Scalise, a Louisiana Republican, gave a speech at a conference of white nationalists when he was a state lawmaker in 2002, the Washington Post reported on Monday, citing his spokeswoman.
Spokeswoman Moira Bagley said Scalise, the No. 3 Republican in the House of Representatives, was not familiar with the ideology of the European-American Unity and Rights Organization, or EURO, when he attended the event in the New Orleans suburb of Metairie, the Washington Post reported.
EURO was founded in 2000 by David Duke, a former leader of the Ku Klux Klan who served in the Louisiana House of Representatives and ran a high-profile race for governor of the state in 1991.
Given the name of the group, and the participation of David Duke, his claim he was unaware of the white racist nature of the gathering are not credible.
As for toleration of right wing threats of violence, there's an ongoing problem in Utah with people with guns threatening Bureau of Land Management employees
(Reuters) - A pair of motorists in a pick-up truck brandished a firearm and flashed a threatening sign at a federal land management agent in Utah, officials said on Thursday, about a month after a widely-publicized armed standoff with a rancher.
...
Crandall said a BLM employee was driving an agency vehicle on Interstate 15 near Nephi, about 90 miles south of Salt Lake City when two motorists whose faces were covered pulled alongside him and made an obscene gesture.
The suspects pulled away but returned minutes later, flashing a gun and a hand-scrawled sign that read: "You need to die," Crandall said.
She said the incident was reported to the Utah Highway Patrol but the BLM agent could not provide investigators with a license plate number because it appeared to be covered with duct tape.
So imagine if some non-honkies in masks threatened a federal employee with guns. There would be a 100 person team from the FBI on the case immediately, and someone would be arrested shortly whether they were involved or not. Not many resources were spent trying to find the perps in this case. Since it's Utah, all that happened is the the BLM has removed insignia from their vehicles.
So not all terrorists are created equal. It counts less if you are white and Christian.