The Electoral Commission announced today it has opened the investigation into whether the movement breached campaign finance rules during this year’s general election.
Momentum is affiliated with the Labour Party and is made up of hard left campaigners who also backed Mr Corbyn during his leadership campaign.
The Commission said in a statement: “The Electoral Commission has today announced it has opened an investigation to establish whether Momentum, a registered non-party campaigner at the 2017 UK Parliamentary General Election, breached campaign finance rules in relation to spending.”
The investigation surrounds whether the group, which is not an official party campaign, breached spending limits for a non-party group.
And it will also consider whether returns submitted by the group, founded in 2015 as a grassroots movement to support Mr Corbyn’s leadership of the Labour Party, accurately recorded donations and payments relating to the 2017 campaign.
The Commission’s director of political finance and regulation and legal counsel, Bob Posner, said: “Momentum are a high-profile active campaigning body. Questions over their compliance with the campaign finance rules at June’s general election risks causing harm to voters’ confidence in elections.
“There is significant public interest in us investigating Momentum to establish the facts in this matter and whether there have been any offences.
“Once complete, the Commission will decide whether any breaches have occurred and, if so, what further action may be appropriate, in line with its enforcement policy.”
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