ACLU is a nonprofit organization that describes itself as "the nation’s premier defender of the rights enshrined in the U.S. Constitution." ACLU's lawyers (and other attorneys who assist them) "handle thousands of cases each year on behalf of clients whose rights have been violated." ACLU provides issue-focused pages of resources on topics such as:
Issue-focused pages include information about court cases and links to selected case documents.
Example of an ACLU Press Release discussing a ruling of the U.S. District Court for the Eastern District of New York:
The Brennan Center for Justice at NYU School of Law describes itself as "a nonpartisan law and policy institute" that "strive[s] to uphold the values of democracy."

Example of analysis:
Brennan Center for Justice Publications at NYU School of Law (HeinOnline)
If you want to compare U.S. national security law/issues to U.K. national security law/issues, you might wish to view: