I read at http://en.wikipedia.org/wiki/Beliefs_and_practices_of_Jehovah%27s_Witnesses that witnesses..
Marking is practiced if a person's course of action is regarded as a violation of Bible principles, reflecting badly on the congregation, but is not a disfellowshipping offense. [104] The person is strongly counseled. If, after repeated counsel sessions, the person still pursues the disturbing course, he might be 'marked', which involves an announcement stating that the actions in question are wrong, without naming the individual involved. Congregation members limit social contact with that person. The purpose of this is to is to shame the person into correcting his actions. [105] They do not completely shun the 'marked' individual, but are instructed to “continue admonishing him as a brother.” [106]
It clearly states,
the person still pursues the disturbing course, he might be 'marked', which involves an announcement stating that the actions in question are wrong, without naming the individual involved.
and then goes on to state,
They do not completely shun the 'marked' individual, but are instructed to “continue admonishing him as a brother.”
So, if the marked individual is not named, how do the rest of the congregation know who to “continue admonishing him as a brother.”?