Here is part of Barry Goldwater's objection to the 1964 Civil Rights Act:

"....I say further that for this great legislative body to ignore the Constitution and the fundamental concepts of our governmental system is to act in a manner which could ultimately destroy the free‑ dom of all American citizens, including the freedoms of the very persons whose feelings and whose liberties are the major subject of this legis‑ lation.

My basic objection to this measure is, therefore, constitutional. But in addition, I would like to point out to my colleagues in the Senate and to the people of America, regardless of their race, color or creed, the implications involved in the enforcement of regulatory legislation of this sort.

To give genuine effect to the prohibitions of this bill will require the creation of a Federal police force of mammoth proportions. It also bids fair to result in the development of an “informer” psychology in great areas of our national life —neighbors spying on neighbors, worker spying on workers, businessmen spying on businessmen, where those who would harass their fellow citizens for selfish and narrow purposes will have ample inducement to do so. These the Federal police force and an “informer” psychology, are the hallmarks of the police state and landmarks in the destruction of a free society."

https://www.nytimes.Com/1964/06/19/archives/text-of-goldwater-speech-on-rights.html