1. Consumer protection in the Spanish Constitution. – 2. Criminal protection of consumers. – 3. Unfair competitions crimes: business secrets discovery and disclosure. – 4. Crimes against consumers: introduction. – 4.1. The crimes of false advertising. – 4.2. The crime of ilegal billing. – 4.3. The crime of detraction of raw materials or staples. – 4.4. The capital investment swindle and the credit scam. – 5. Crimes against free market and or free competition. – 6. Final comments.