Labour breached privacy rules by making unsolicited automated phone calls to almost half a million people without their consent, the Information Commissioner's Office has ruled.
The calls, featuring a recorded message from Coronation Street actress Liz Dawn, were targeted at around 495,000 people in areas with strong Labour support to encourage them to turn out to vote in the local and European elections last June.
Deputy Information Commissioner David Smith said calls of this type can cause "annoyance and disruption" to those receiving them.
He ordered Labour to ensure that no further automated direct marketing calls are made without consent, warning that failure to comply would be a criminal offence which could lead to prosecution.
Labour had previously said it would stop automated calls of this kind after the Commissioner received a complaint about the use of the Liz Dawn recording in 2007, said Mr Smith.
At the time of the 2009 elections, the Commissioner received further complaints from a member of the public and the Scottish National Party.
Labour confirmed that it had made the calls to approximately 495,000 recipients, in what were believed to be Labour supporting areas, and that the majority of numbers were obtained using commercially-purchased lists.
Mr Smith said: "The Labour Party has breached privacy rules by making automated marketing calls to individuals who have not consented to receiving such calls.
"The fact that the calls were targeted at what were believed to be Labour supporting areas confirmed our view that they were designed to promote the Labour Party's electoral cause by encouraging Labour supporters to vote."
The Labour Party has 28 days to appeal against the enforcement notice under the Privacy and Electronic Communications Regulations, which were introduced by the Labour Government in 2003.
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