The establishment of shell companies (i.e. companies with no actual business activities) may be used to conceal the source of funds for illegal activities, including but not limited to the following: 1. **Money laundering**: Illegal funds can be mixed with legitimate funds through shell companies to conceal their source. For example, illegal income can be made to look like legitimate business income through fictitious transactions. 2. **Tax avoidance**: Some criminals may use shell companies to register in low-tax or tax-free areas (such as offshore financial centers) to reduce tax burden and hide assets. 3. **Concealing the true owner information**: Shell companies are usually difficult to trace their true owners, and criminals can hide their identities through complex equity structures, trusts or agents. 4. **Forged contracts or invoices**: Through shell companies, false business transaction records can be created to conceal the flow of illegal funds. 5. **Financing or lending activities**: Shell companies can be used to obtain loans or financing, thereby legalizing illegal funds. Although shell companies can help conceal illegal funds in some cases, many countries and regions have strengthened supervision of company registration and financial transactions to combat money laundering, tax evasion and other financial crimes. Therefore, using a shell company to engage in illegal activities carries a high risk and carries serious legal consequences.