A purge is quite common in academia and similar groupings.

We had one at the uni near where I live. One professor had an agreement on a work schedule that made it possible for her to see her children, who lived in a different city, two days a week. When the other side of the conflict took over the institute that agreement was cancelled. The wife of a professor on the "wrong" side, who was also a professor at the same institute, lost her regular lecture hall and had to conduct her lectures on the other side of campus up a steep hill. She was in a wheel chair. The third professor was defined out of the institutes research profile and forced to leave his long term research in order to teach introductory classes for new students and preparation classes for high school students. A fourth professor, who was technically illiterate, was forced to leave his research and lead the institutes new IT program, which included summer classes.

There are many different ways to push people out of a community, to purge the community. Considering that there is a very real chance that this will happen in the Bitcoin community I would be more careful with boisterous proclamations calling for exclusion and vigilance. Theymos is already doing everything he can to shut people down. Adam Back and Gmaxwell have been making some less than reassuring noises as well. If you really believe in an open and free community I suggest you take this to heart.