The Civil Rights Act of 1964 gave the federal government unprecedented power over the hiring, employee relations, and customer service practices of every business in the country. The result was a massive violation of the rights of private property and contract, which are the bedrocks of free society. The federal government has no legitimate authority to infringe on the rights of private property owners to use their property as they please and to form (or not form) contracts with terms mutually agreeable to all parties.
The Civil Rights Act of 1964 not only violated the Constitution and reduced individual liberty; it also failed to achieve its stated goals of promoting racial harmony and a color-blind society.

2004-07-03 speech to Congress opposing House resolution celebrating 40th anniversary of Civil Rights Act, quoted in "Civil Rights Act", RonPaul.com