What is the strength of your company? If it is large, you can help them get registered and keep the union under your control. Otherwise, you can create another union and encourage the maximum number of employees to join the union you have established. Once approved, register this union with the Labour Commissioner's Office. This way, the Trade Union will be under your control, and you will not encounter any work-related issues.
Review the Trade Union Act
Please review the Trade Union Act, as recommended by White Eagle. I have attached it for your easy reference.
All the best.