 On the one hand, John Hardwig (1985) argues for a positive answer here. That is, Hardwig argues that if we acknowledge that groups can testify, we should also acknowledge that groups themselves can be knowers, and thus believers too (see also Lackey (2016) for an argument to the effect that groups can possess justified beliefs). On the other hand, Faulkner (2018) argues against this line of thought and suggests that even if groups can testify, this does not entail that they possess any mental states.