The deceptive Activist

In your action group, is it ever beneficial to lie to other members? When is it wise to lie to authorities? If a member of your group has done something wrong, is it better to be open about it now or keep it hidden in the hope that outsiders will never know? What are the pros and cons of infiltrating opposition groups to collect information about harmful activities? Should we wear masks at rallies? Theres lots of research showing that lying is an everyday occurrence in most peoples lives, and furthermore that lies can be beneficial in some circumstances. But they can also be very damaging, especially lies by authorities.