The Connecticut Citizens Defense League says its membership has nearly tripled — to about 7,500 people — in the past few months, ever since state officials began discussing the possibility of gun control measures in the wake of the shootings at Sandy Hook Elementary School.

Now the organization is attempting to turn that manpower into legal might. The group is one of the lead plaintiffs in a lawsuit filed Wednesday, May 22 challenging the constitutionality of sweeping legislation recently approved by the Connecticut legislature.