Adam Thomas and Claudia Patatas - who named their baby after Hitler - and Daniel Bogunovic were all found guilty on Monday of belonging to the banned group.
The group was founded in August 2013 by Benjamin Raymond and Alex Davies, the latter who was once quoted as saying “I don’t want to say what I’d do to Jews, it’s too extreme”.
Meanwhile Raymond said he "loved Hitler" and that there "are non-whites and Jews in my country who all need to be exterminated”.
The group’s logo borrowed heavily from that of the Second World War Nazi organisation the SA, the Sturmabteilung, who were more widely known as the Brown Shirts.
NA was also known for its slick propaganda on social media, but also leaflets and stickers, with mottos such as “White Jihad” and “Britain is ours – the rest must go”.
It had its own Strategy and Promotion document calling for "extreme forms of racism and anti-Semitism".
Director of the Centre for Analysis of the Radical Right, Professor Matthew Feldman described the group as “potentially the most dangerous… of any fascist movement to appear in the UK for many years”.
The group itself would proclaim in August 2015, that “only bullets will stop us”.
Its first demonstration was a banner drop in Birmingham in November 2013.
The organisation hit headlines when members voiced support for the murder in June 2016 of, with its North East division’s Twitter account stating: “Vote Leave – don’t let this man’s sacrifice be in vain.
“Jo Cox would have filled Yorkshire with more sub-humans.”
Another tweet said: “Chat s***, get banged.”
The organisation even took Mair’s outburst at his trial – “death to traitors, freedom for Britain” – as its slogan on its former website.
Members attended demonstrations along with other far right groups, in places like York, Liverpool, Darlington and Newcastle.
At its height, NA had between 70 and 100 members, recruiting mainly young people aged between 15 and 29, but also trying – and succeeding in at least one case – to attract members of the Armed Forces.
Announcing the ban, Ms Rudd said: “National Action is a racist, anti-Semitic and homophobic organisation, which stirs up hatred, glorifies violence and promotes a vile ideology, and I will not stand for it.
“It has absolutely no place in a Britain that works for everyone.”
The group had not carried out any terrorist attacks but was linked to a plot to kill Labour MP Rosie Cooper.
In total, 10 people have now been convicted or admitted membership of the terrorist group.
Counter-terrorism police are continuing to investigate suspected off-shoots of National Action.