Members of the nationalist True Blue Crew are planning to "take a stand on the streets" in response to Melbourne's so-called 'African gang crisis'.

Posts on their public Facebook page say the Crew will meet Sunday afternoon in the south-eastern suburbs to discuss possible action.

Police are on high alert and will monitor the meeting. The Crew is attempting to frustrate those efforts, keeping the details of the exact location under wraps. Participants will be sent location details Sunday morning, and photo ID will be checked at the door.

Legal advocates, meanwhile, say it is just the latest symptom of a growing movement toward vigilantism, the flames of which are being willingly fanned by our political leaders.