The Corbyn cheer-leading organisation “Momentum” claims to be able to contact all the people who signed up to support Jeremy Corbyn during the leadership contest, but they might not have permission to do so. When people signed up as supporters of the Corbyn4Leader campaign, they were asked to give their email addresses and postcodes; the campaign said they were collecting this information to “enable us to carry out casework on behalf of constituents; issues and campaigns we are involved with locally; maintaining our own accounts and records; supporting and managing our employees and agents.”

According to the Information Commissioner’s Office “individuals should generally be able to choose whether or not their personal data is disclosed to another organisation” and if an organisation does intend to disclose information to another organisation, “fairness requires that you tell the individuals concerned unless they are likely to expect such disclosures.”

If Momentum is a stand alone limited company and doesn’t share any formal links with other organisations as they claim, what right did the official Corbyn campaign have to pass over the sensitive personal data of its supporters to them?