A DOZEN protesters from a fathers' campaign group disrupted a constituency surgery held by Wakefield MP David Hinchliffe.
Demonstrators from Fathers 4 Justice wore decontamination suits as they burst into the Labour MP's Wakefield office.
They were angry over his failure to back Commons calls for equal rights for fathers when relationships collapse.
Paul Midgley, Fathers 4 Justice co-ordinator, said: "Fathers in his constituency are crying out in despair at the way they have their children taken away from them, and our MP is refusing to help."
Mr Hinchliffe said he was happy to listen to their concerns, adding that parents of either sex should be treated even-handedly.