Did Pittsburgh Police violate the protesters Constitutional Right to Assemble?

Here is, in part, the Constitution of Pennsylvania. Judge for yourself if the Police Chief had the authority to declare this an UNLAWFUL ASSEMBLY.

CONSTITUTION OF THE

COMMONWEALTH OF PENNSYLVANIA

Article 1 

DECLARATION OF RIGHTS

Political Powers

Section 2.
All power is inherent in the people, and all free governments are founded on their authority and instituted for their peace, safety and happiness. For the advancement of these ends they have at all times an inalienable and indefeasible right to alter, reform or abolish their government in such manner as they may think proper.

Right of Petition

Section 20.
The citizens have a right in a peaceable manner to assemble together for their common good, and to apply to those invested with the powers of government for redress of grievances or other proper purposes by petition, address or remonstrance.

No Discrimination by Commonwealth and Its Political Subdivisions

Section 26.
Neither the Commonwealth nor any political subdivision thereof shall deny to any person the enjoyment of any civil right, nor discriminate against any person in the exercise of any civil right.