A quick definition of ACLU:

ACLU stands for the American Civil Liberties Union. It is an organization that works to protect the rights and freedoms of people in the United States. They believe that everyone should be treated fairly and equally, no matter who they are or what they believe. The ACLU helps people who have been treated unfairly by the government or other powerful groups. They also work to change laws and policies that are unfair or discriminatory. The ACLU is an important organization that helps to make sure that everyone's rights are protected.