Is the American civil liberties union a economic or non-economic interest group?

They are a non-economic interest group

Explanation:

The ACLU was founded to ensure the promise of the Bill of Rights and to expand its reach to people historically denied its protections. In our first year, we fought the harassment and deportation of immigrants whose activism put them at odds with the authorities. In 1939, we won in the Supreme Court the right for unions to organize. We stood almost alone in 1942 in denouncing our government's round-up and internment in concentration camps of more than 110,000 Japanese-Americans. And at times in our history when frightened civilians have been willing to give up some of their freedoms and rights in the name of national security, the ACLU has been the bulwark for liberty.