The activists' arrest for peacefully assembling in the Mall of America potentially violates their First Amendment right to assemble. While private property rules apply, if the location functions as a quasi-public forum and the assembly is non-disruptive, the arrest may infringe on their constitutional rights.
The right being denied in this scenario is the right to peacefully assemble, which is protected under the First Amendment of the United States Constitution. Peaceful assembly is a fundamental right that allows people to gather, express their views, and petition for change.
The activists' arrest for trespassing while peacefully assembling at the Mall of America could potentially be viewed as a violation of their First Amendment rights. The authorities arresting them on trespassing charges might argue that private property rules were violated.
Courts have sometimes recognized such spaces as quasi-public forums where free speech rights are partially protected, especially if they're commonly used for public expression or assembly. The key point would be whether the location was considered a public space in some capacity and whether the assembly was peaceful .