Two people have been charged with leaking the names and details of the entire British National party membership.
The list, which identified thousands of people linked to the far-right party, was posted on the web in November 2008. Information included addresses and other contact information such as mobile phone numbers and the names and ages of children in a family membership.
Dyfed-Powys police said a 27-year-old man and 30-year-old woman were charged under the Data Protection Act after a joint investigation with the Information Commissioner's Office. The pair lived in the Nottingham area at the time of the leak.
The fallout included the outing of police, lawyers, teachers and church figures as BNP members, with some complaining the leak exposed them to the risk of dismissal or disciplinary action. Some included on the list, which ran to 13,000 names, complained they had been mistakenly included after only asking for information on the party. Others said they were no longer members.
In one entry of a woman believed to be a serving police officer from Wirral was the note "Discretion required re employment concerns – police officer", along with the names and ages of her children.
The BNP leader, Nick Griffin, claimed at the time to know the identity of a person who had leaked the information, calling them a hardline senior employee who disagreed with the direction of the party and left the party in 2007. The party called in the police and obtained a high court injunction to stop the list being published but was forced to admit it was relying on the Human Rights Act, which it opposes, to protect members' privacy.
The party said the leak was "malevolent and spiteful" but the list was not up to date and only included names of members up to 2007.
The BNP goes to considerable lengths to conceal the identities of members, including dividing lists between different people and encrypting and password-protecting email attachments.
The two people charged are due to appear in Nottingham magistrates court on 1 September.
Police charged two people for Data Protection Act offences in relation to the November 2008 leak of the members list of the far-right British National Party (BNP).

Following a joint investigation between Dyfed-Powys Police and the Information Commissioner's Office, a 27-year-old man and 30-year-old woman were arrested and charged under Section 55 of the Data Protection Act 1998. The pair lived in Nottinghamshire, England at the time of their arrest. They will appear before a Magistrates' Court on September 1.

The leaked list is available online, and contains personal information of about 10,000 BNP members, including information on their family, work and contact details. Despite a High Court injunction to prevent the list from being published, it is available on numerous websites.

The list revealed the BNP had members who were lawyers, doctors, police officers, teachers and servicemen. Certain professions forbid BNP membership, and the list's publication resulted in several dismissals.

A spokesman for the BNP praised the police and Crown Prosecution Service for treating it "seriously", stating that the leak had caused "a lot of distress".