The article explains the rules around working in the US with a tourist visa, which is also known as a B-1/B-2 visa. It explains that any unpaid voluntary work, as well as paid performance-related work such as concerts, sporting events and conventions, is allowed. However, engaging in any activity that constitutes regular employment, such as a salaried job, is prohibited. Additionally, the article notes that a tourist visa holder can take part in a business or educational seminar or conference, but they are not allowed to be paid for their participation. Overall, a tourist visa holder must be careful not to engage in any activities that could be considered employment.