I totally agree that no homebirth midwife should be using cytotec without full disclosure of risk and benefits to parents (or doing anything at all without true informed consent). Of course, I also believe that no birth practitioner should be putting cytotec anywhere near a pregnant or pp woman, either...but that's another discussion.
and I totally agree that it is right to first approach the mw/s doing this where that is possible, or otherwise to find someone closer to said mw/s who will first speak to them. If such person-to-person contact (and/or perhaps a group contact with said mw/s) does not succeed, then yes, it should be brought to the attention of licensing board (or whatever it's called there). To me, being a midwife (or student mw) includes not just a responsibility to obtaining knowledge and skills to provide best care, but also a responsibility (of some kind/degree) to the profession itself...it means willingness to look beyond your own personal business to the good of midwifery--and of course, client safety--on the whole. Dishonest and/or dangerous practices are not good for midwifery or clients!
However....
I have been involved in the matter of a 'risky mw' in my neck of the woods. I started out by telling her myself, after following her for a few weeks with an eye to partnership, that I could not work with her because of certain issues, which I named. At the time, I said I wasn't judging her, and that these things were perhaps only a difference of style--and affirmed that I wanted to remain in contact, work amicably in the community as colleagues providing mutual support, etc. Next thing I know, word came back to me--from someone who heard it from her--that she was saying very nasty things about me to homebirth families. I had just returned to practice at that time, and began meeting many people--her former clients as well as other professionals such as chiros and hb backup OBs, her own former apprentices and doulas--who told me many troubling things about that mw's practice. Next step I took was to communicate with other mws far away about these issues (people who I figured didn't know her personally, to try to minimize drama), to get their view of these practice matters and some kind of advice. All confirmed my views of her riskiness and some urged me to do what I could about it--people who did know her after all, and had themselves in years past also met with her and tried to talk to her about the same things (urging her to get more training, keep up with changes, etc--people who tried to be positive and supportive of her, to no avail whatever).
To make a long story shorter: I'd already tried talking to her myself, next thing I did was try to motivate various others to talk to her...former clients, these other professionals. No way! No one would get involved. Then I decided not to do a thing...mind my own business, not think about it. That worked for almost a year, but then I was basically dragged back into this by being contacted by a chiro who'd treated one of her babies, oy. It was the last straw...and I again tried to motivate help with this issue. This time, a sort of committee was convened, discussions held, and an action was taken (someone agreed to be the spokesperson and go to her).
Anyway...all this is leading to the point that while I totally believed and still believe that someone had to instigate action...and I was willing (reluctantly) for that to be me...I have suffered some of the worst effects from this. It might not make you popular, taking action. Be prepared to be judged, gossiped-about, suspected of ulterior motives. The mws in question will surely spread calumny about you in their own defense...but they will also have supporters who might well help in that work. Still others--who might actually agree with your basic premise--might think that it's just wrong for a mw to mind anyone else's business or do anything that 'might damage midwifery'...or will be just plain too chickensh*t or two-faced to do/say anything about it. Some consumers might believe whatever they hear about you, whether or not they liked or even knew that other mw. And hey, one reason that the med institution is so powerful is that they DO try to keep such secrets, they do close ranks and protect their dangerous own, as a way of protecting themselves/their own popularity and bottom line. No matter that such a choice is unsafe and unethical!
Anyway--I don't mean to be discouraging..and you surely WILL have some support for this. But I do think that you need to be aware that this action does have its pitfalls--I wish someone had warned me how ugly it might get. Can't say for sure that understanding this in advance would have helped--but it sure couldn' t have hurt! Forewarned is forearmed, as they say.
Be brave, and thanks for caring. This work is not for the faint of heart! Especially not this particular part of this midwifery work.