How to address in-group bullying without compromising PhD/career? I've been bullied by my supervisor and other members of my research group for the past couple of years.

Some of the things which have indicated bullying include snide remarks being made during group meetings, exclusion from the group inside and outside of the research environment, not being kept in the loop for group projects and even my own project, having key work on my project assigned to someone else, being given unreasonable loads of work to complete in an unrealistic time frame, being called upon and humiliated during meetings in front of colleagues, being immediately blamed for any issues in the group without allowing for an explanation, having rules change on me last minute and not being informed of these, and being subjected to massive double standards overall.

There are also a few more serious issues, involving threats to remove me from the program, use of my content without referencing me, removing me from projects I had planned on publishing from and giving them to others without informing me until they have conducted 'my' work and published it, and having them ignore university policies in favor of their own rules. 

I have spoken to PhD advisers, advocacy reps, and other staff members about this, but have not wished to pursue any formal complaints procedures out of fear my supervisor will compromise my PhD (by reassigning all the novel aspects of my project to someone else, or not providing feedback on my thesis), and ruin my ability to work in research (by preventing me from publishing during my PhD, providing negative references, ruining my reputation in the field).

Long story short, does anyone have any advice on how to approach this situation without compromising my PhD or future career in the field, something my well-respected and rather manipulative supervisor could easily do without getting caught?
I have spoken to … but have not wished to pursue any formal complaints procedures out of fear my supervisor will compromise my PhD … and ruin my ability to work in research … 


Okay, so I am going to be the bad-guy here.  What you say you fear will happen here has already happened.  What you describe ---if accurate--- is already massively compromising your PhD and your ability to research.  The university has formal mechanisms in place to deal with this kind of issue.  If you are not willing to avail yourself of the mechanisms in place to deal with these problems then there is nothing that anyone can do.  (And frankly, it is quite difficult to muster sympathy for complainants who refuse to make a proper complaint when avenues are available for this.)  You should have complained formally or got out years ago, but since you are still there you have a choice: use the mechanisms available to you for complaints of this kind, or not.  Do not become a victim of the sunk cost fallacy.

If you decide to avail yourself of the complaint mechanisms at your university, the main thing you should do is this: document, document, document.  Document everything well, and collect and keep all relevant evidence of treatment that is unfair to you.  Make a chronological list of incidents, since the start of your candidature, detailing dates (or rough dates if you can't remember exact dates), what happened in each incident, and any documentation (emails, etc.) that constitutes evidence of the incident.  Write this in a neutral factual way, but make sure you briefly explain how each incident negatively affected your candidature.  Seek written statements from other sympathetic students that can back up your assertions.  You have said that the university has breached its policies when dealing with you.  Make sure you document instances of this as well.  If that is correct, then the university will be in a weak position in respect to the conflict, and you have a greater prospect of extracting some reasonable concessions in a complaint process.