A high-profile hotelier sent a private investigator to a community meeting opposing his latest poker machine venue with instructions to ensure the residents didn't defame him.

The incident, which has prompted claims of intimidation and bullying, comes as Peter De Angelis has lodged a new development application to build a pub near a public school in Casula.

David Seedsman, private investigator and employee of De Angelis Hotels, followed residents after refusing requests that he leave their anti-pokie meeting.

His first attempt was rejected by Liverpool Council in the face of a community backlash and petition by students.

Former policeman and insurance fraud investigator David Seedsman stood in front of the group, two-thirds of whom were women and children, as they met in a Casula cul de sac on Wednesday night, refusing to leave when asked.