What term refers to the action of a group deciding to remain assembled despite being commanded to disperse?

The term that describes the action of a group deciding to remain assembled despite being commanded to disperse is "defiance." This term encapsulates the spirit of resisting authority or commands, reflecting a conscious choice to disregard orders. In this context, it emphasizes the group's determination to stand together against an imposed directive.

The other options do not capture the specific meaning of remaining assembled in the face of authority. "Protest" refers to a public demonstration expressing disapproval or objection but does not necessarily imply a refusal to disperse. "Contempt" generally relates to a lack of respect for an authority figure or the court and involves an underlying legal context. "Obstruction" pertains to impeding or hindering the progress of something, which may not directly correspond to the action of a group choosing to stay assembled despite orders. Thus, "defiance" is the term that best fits the scenario described.