What should I do if I believe my former advisor is alleging to journal editors that I have copied his study? I have been through many different things with my previous advisor.  


He wrote publications with my research proposal with his former female student after forcing me to give up the topic.  Also, as soon as I completed the simulation study for a different study, he asked me to stop again and then gave it to her again (she published it as a single author). 
He simply asked me a personal relationship. I told him no.  Then he did his best to kick me out of my program. Even my Dept. and graduate college forced me to leave without my degree for about 6 months.   


Luckily, I completed my Ph.D. and I am now doing my post doc.  Recently my paper has been rejected in the 2nd round from a top journal.  I heard from a colleague that my previous advisor called the chief editor (who was his student) and asked him  not to accept my paper, alleging I copied his study (it cannot be true).   

Despite my experiences as his advisee, I haven't ever talked about anything about him because I need a job.  He just made a lot of crazy rumors about me, but I have been quiet.  Should I be quiet again?
I would talk to the conciliation board on your university and to the editor . Ask your colleague, if he/she will confirms that information in front of the conciliation board. Furthermore, I would do some research (or hire someone) about code of conduct on your university valid this case. Last but not least I would write down every single accusing in a chronological form (kind of factual report).

Maybe you can prove by the timestamps of your files, that he copied ideas from you and not the other way.