What “plan” they had was the fantasy that those sympathetic politicians would unilaterally abolish elections, which they don’t have the power to do either individually or as a group, and would not do even if they could. Only the military can do that, so they would have had better prospects targeting the Pentagon. So essentially no plan, they were trying to alter reality by willing it into existence.
Thats kind of the point, they’re so (deliberately) underfunded they have to farm out jobs to subcontractors which boil down to “vigilante goes to place, murders a bunch of people”.