Check out: Committee on Publication Ethics
The international organisation Committee on Publication Ethics (COPE) supports and educates editors, publishers, universities and scientific institutions on all aspects of publishing ethics. COPE runs a website with a lot of information on how to deal with, for example, plagiarism, authorship disputes or scientific fraud. The website contains flow charts that show step by step how to deal with suspected misbehavior correctly. Numerous cases are described and clearly substantiated recommendations are given. Besides being instructive, the website is also entertaining because it regularly raises interesting questions around scientific publishing. For journal editors a very valuable website and definitely worth checking out.