There is no federal law that specifically prohibits telemarketing, but there are a number of laws and regulations that place restrictions on how telemarketers can operate. The most notable of these is the Telephone Consumer Protection Act (TCPA), which prohibits certain types of telemarketing activities, such as making unsolicited calls to consumers who have placed their phone numbers on the national Do Not Call Registry. In addition, many states have their own laws regulating telemarketing, so it's important to check with your state's attorney general's office to see if there are any additional restrictions in place.