Police search locations in 12 states, mainly in the East and South of the country in what prosecutors say is a targeted raid.
Theodore Hopes has been sentenced to a two-year community order for making threats to kill.
City of York Council's Peter Kilbane says investment in culture is needed to combat the far-right.
The judge says Harry Whittaker, who had a Nazi flag on his bedroom wall, is "highly intelligent".
The civil engineer was seen in the front row of a protest organised by the National Socialist Network.
Father Mark Rowles was arrested by counter terror police for extreme right wing activity on social media.
Nikos Michaloliakos, 67, who gave Hitler salutes at rallies, is allowed to serve the remainder of his sentence from home.
Ondrej Sidelka, 21, "created an online library" of far-right material in a Dropbox folder, a jury hears.
Callum Parslow, who was already convicted for stalking, has now been jailed for attempted murder.
