Though there is a good case that breaking that rule is the best action. Getting kicked out probably did more for their cause then their protest. They just need the guts to publicly stand by.
Others have already quoted TFA, which rightly points that the distributing (by some of the coauthors) of an article published in the journal of a medical association, at the conference of the said medical association, a conference which has the claimed purpose of exchanging information between the members who attend the conference, can hardly be called a "protest" or a "violation of the code of conduct".
There are few cases where it is so clear cut that only the organizers have violated the code of conduct, and not those who were expelled from the conference.
Others have already quoted TFA, which rightly points that the distributing (by some of the coauthors) of an article published in the journal of a medical association, at the conference of the said medical association, a conference which has the claimed purpose of exchanging information between the members who attend the conference, can hardly be called a "protest" or a "violation of the code of conduct".
There are few cases where it is so clear cut that only the organizers have violated the code of conduct, and not those who were expelled from the conference.