Unfortunately, yes. It's not even a new phenomenon.

When I was in high school, I drove a friend to visit his girlfriend at night. We arrived at a locked gate in the middle of nowhere, in the mountains of South Carolina. Moments after we arrived, someone drove up in a truck to let us through the gate, after shining a flashlight into the car at every passenger. We drove down a gravel road, about a quarter mile, into what can only be described as a compound. A few men with AR-15s and in fatigues were milling about. I learned later (after my friend had broken up with her) that her father was a militia leader; she wasn't allowed to socialize with black folks or Jews or LGBTQ folks. That was ~25 years ago.

Before the recent crackdown, you could readily find discussions on the web from many of these groups, where they talk about their goals and plans; often in a generalized way that likely wouldn't be legally actionable, but it's easy to read between the lines. They train together on military tactics, they discuss guns and military gear, and they actively recruit people in the military and police officers for their tactical skills and access to weapons. Many have bunkers, or compounds, where they plan to hunker down when the race war they seek finally comes.

Stormfront.org, one of the leading neo-Nazi forums, remains up and running, but the interesting topics (like "Strategy and Tactics" and "Self Defense, Martial Arts, and Preparedness") are private, and require an invitation. Some people have found their way in over the years, though, and stuff has leaked out.

The various groups have different priorities, and some are more militant than others, but the militant branches were well-represented at Unite The Right, as evidenced by the presence of dozens of AR-15s and men in military gear.

The Klan has been a militant racist presence in the US since the end of the Civil War, with literally thousands of lynchings at their back, with the most recent that I know of being in 1998 in Jasper, TX. The Klan had been in decline for decades before Trump. This is the first major event where the Klan had a large and visible presence that I'm aware of in recent years.

III%ers are probably the most active/obvious in military training for their members. They do not officially have a white supremacist message, but their presence at Unite the Right was large, and they were marching and chanting with gusto (they were the folks with the AR-15s and military fatigues, as I understand it). They are explicitly and visibly training for violent revolution. The name derives from a belief that 3% of people in the American colonies waged the Revolutionary War to achieve independence from Britain, and they will be the 3% that takes up arms to tip the US into revolution.

Oath Keepers were another presence at the event, and it is made up of former/current police and military. They don't publically claim to be a white supremacist organization, but their obviously supportive presence at many white supremacist events speaks volumes. I find them among the most frightening, as their numbers are large and they have military training, presence within local police forces, etc. As with III%ers, they avoid racist messaging and speak fondly of the Constitution, which gives them a patina of legitimacy.

A number of the other groups that were present, like Traditionalist Worker Party, Vanguard America (the group James A Fields was photographed with and seemingly claimed affiliation with), and Identity Evropa, are quite recent, founded just in the past few years. Much like the term "alt right", these groups seem like rebranding efforts to make white nationalism and white supremacist groups more marketable to young audiences. It also sanitizes their history; the people who operate these groups (and profit from them) have often long been associated with white supremacist groups but in less notable roles. The presence of well-known white supremacist figures (many of whom have spent time in prison for terrorism and violence) among the recently founded groups at Unite the Right seems to make this connection pretty clear.

It's all part of their model for achieving respectability, which has worked frighteningly well. Our president has effectively endorsed them as "very fine people". Then again, his father was a Klansman, and Trump himself has been successfully sued for violations of the Fair Housing Act in treating people of color unfairly in his rental properties.

Anyway, their online presence has sort of gone underground recently, so it's actually harder to find their discussions. It happens in private facebook groups, on twitter and YouTube under pseudonyms which come and go (kinda like ISIS), and even IRC on private servers. You can still find wikipedia coverage of them and Anti-Defamation League and SPLC coverage on their hate group monitoring sites.

The thing about hate groups is that they can only appear respectable for so long before revealing their hand as a racist hate group because they aren't spreading their message of white supremacy during that respectable phase.

Sorry, this got a little long. Curiousity got the better of me as I started digging into the actual list of participants and who's connected to what organizations through the years. It's an incestuous group. These are just some really nasty people with a long and violent past, many were radicalized in prison. No matter how "dapper" they dress today, there's not really any hiding how ugly they are as human beings.

Edit: I think I should also make clear that these people are a very small minority of Americans. Their beliefs are repugnant to a majority of us. While the US does have a very troubled history and present on issues of race, and we do have many systems that further white supremacy, overt racism is not considered acceptable on the whole.