Krewson has been facing resignation demands after recently doxxing residents for writing letters asking to defund the police, and the march Sunday evening was to end at her home to re-up that request.
The couple's "Midwestern palazzo" home was featured in St. Louis Magazine in August 2018 after they completed a major renovation.
Husband and wife, Mark and Patricia McCloskey who are both personal injury lawyers, could be seen aiming the guns at demonstrators who walked by their palatial property in the wealthy Forest Park neighborhood at around 6pm on Sunday. Mark McCloskey is heard shouting.
Patricia McClosky points a handgun at the crowd of about 300 unarmed protesters.
Videos show some protesters attempting to engage in conversation with the couple, telling them to calm down, but others urged them to keep moving instead.
According to the Missouri state law, a person commits the offense of unlawful use of weapons "if he or she knowingly exhibits, in the presence of one or more persons, any weapon readily capable of lethal use in an angry or threatening manner".
The videos travelled around the internet.
Opinion polls show the Republican Mr Trump trailing his likely Democratic rival in the 3 November election, former Vice President Joe Biden, and an increasing number of Americans sympathising with protesters and support policing reforms.
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