Fathers 4 Justice have been campaigning since 2003 to raise awareness of the inequalities in parental access rights.
Mr Malloy said: "The issue that Fathers 4 Justice campaign for is still very much alive, but the group itself has been in slow decline for the last 12 to 18 months.
"They were really successful at first but they needed to step up their game, but they have just been losing momentum. They had loads of public support at the beginning but the stunts kept on disrupting normal people so they have started to alienate people who used to sympathise with them."