if author tries to publish an article in a journal that is verbatim copy of an article published earlier in another journal you must immediately inform the editor of journal where copied article was published

2) the editor can write an article highlighting the plagiarism

3) also inform the association where author is member regarding the mis conduct of the author

1. The violation of copyright is a civil wrong for which suit for injunction and damages can be filed in the court of district judge.

2. Only the court of law has right of adjudication and no other authority.

3.So first send him a legalnotice of desisting from violating the copyrights and if he refuses to do so then you can file suit for injunction as advised above.

Plagiarism is the "wrongful appropriation" and "stealing and publication" of another author's "language, thoughts, ideas, or expressions" and the representation of them as one's own original work. Plagiarism is considered academic dishonesty and a breach of journalistic ethics. It is subject to sanctions like penalties, suspension, and even expulsion.

Plagiarism is not in itself a crime, but can constitute copyright infringement. In academia and industry, it is a serious ethical offense.[4][5] Plagiarism and copyright infringement overlap to a considerable extent, but they are not equivalent concepts, and many types of plagiarism do not constitute copyright infringement, which is defined by copyright law and may be adjudicated by courts. Plagiarism is not defined or punished by law, but rather by institutions (including professional associations, educational institutions, and commercial entities, such as publishing companies).