What are the industrial disputes concerning Union employees?
The context provided does not explicitly define what industrial disputes concerning Union employees are. However, it can be inferred that they likely refer to any disagreements or conflicts between employees and employers within industries controlled by the Union government, such as those in sectors related to oilfields, mineral resources, labor safety in mines, salt distribution, opium cultivation, and cinematograph film regulation. These disputes may involve issues such as wages, working conditions, job security, and other terms of employment. However, without further context or information specific to these industries, it's difficult to provide a more detailed answer.