You can learn all about the American Civil Liberties Union (ACLU) from Wikipedia on the Internet.

Free speech guaranteed under Article I of the Bill of Rights also provides the right of the people "... to petition the Government for a redress of grievances."

While the Bill of Rights provides the right to petition the Government for a redress of grievances, the Bill of Rights does not provide anyone (individual or organization) freedom or license to sue, the Government at any level of government, or any Private Agency or institution, for what such litigants interpret as a grievance against some legal, civil, ethical or moral practice.

A most prominent example here is ACLU interpretation of a non-existent separation of Church and State. ACLU says government locations cannot display the 'Ten Commandments', manger scenes at Christmas time, or any symbols of Judaism or Christianity at any time in public places or placess occupied by government offices.

Perhaps the most egregious function of the ACLU are "Lawsuits" (brought by the ACLU) that have been influential in the evolution of Constitutional law.

Ever since its inception, the ACLU has functioned like members of the U.S. Supreme Court, making their own interpretations of what the U.S. constitution says, or doesn't say, about the rights and priveleges of private U.S. citizens, or private U.S. citizen organizations, or the constraints imposed on Government or Government Agencies, by the U.S. Constitution of and for government.

Not long after her death in 2007 at age 62, Molly Ivins, a popular left wing columnist, was celebrated by the ACLU. Of all the praises bestowed on her, one was memory of an accusation by one her critics, that she was a 'socialist'. The ACLU gushed admirably over Ivins' one word answer, "So?"

Time is overdue for some private conservative foundation or organization to sue the ACLU on criminal charges, for impersonating the U.S. Supreme Court as an institutional entity and its members thereof.