It is not possible to know their names. So we will just dub them Mr Backpack, Mr Goldshades, Mr Marlboro and Mr Shortsleeves.
They are among the mysterious characters who showed a surprising interest in the street activities of veteran activist and self-professed professional Marxist Leung Kwok-hung when President Jiang Zemin was in town.
Mr Leung is an easy guy to track, not least because of his waist-length hair and his habit of carrying a huge coffin daubed with slogans such as 'Reverse the verdict on June 4'.
So maybe it is charitable to assume the mysterious chaps who made such a bad job of following Mr Leung around were trainees. Maybe after they graduate they can try to trail someone with ordinary-length hair who does not carry a coffin.
As an example, Mr Leung's April 5 Action Group rallied outside Wan Chai MTR at 5.30pm on Wednesday. After a short speech, they gathered their banners together and started marching towards the Convention Centre where Mr Jiang would soon eat his banquet.
The moment the 50-odd demonstrators moved off with their coffin, various members-of-the-public who were doing ordinary activities such as waiting for the bus decided to spontaneously start walking in the same direction.