Bitcoin and other cryptocurrencies have been associated with criminal activity due to their anonymous nature and decentralized structure. Criminals have used crypto for money laundering, ransomware attacks, drug trafficking, and other illicit activities. However, it's important to note that these actions are committed by a small percentage of users, and the majority of crypto transactions are legitimate. Governments and regulatory bodies are working to implement measures to combat crypto-related crime and promote a safer and more transparent crypto industry. It's important for users to exercise caution and adhere to security measures when engaging in crypto transactions.