This past year brought to the fore some challenging international labor and employment law issues that are likely to grow in importance in 2015. Some of these issues became front-page headlines—among them the recent Sony Pictures data breach, the Volkswagen union drive in Tennessee, and the Securities and Exchange Commission's award of $30 million to an overseas whistleblower.

Other developments illustrate the increasing strength of global unions and the ever-growing importance of corporate compliance. The continuing importance and expansion of these issues highlight their increased complexity and correspondingly increasing challenges for multinational employers (MNEs).

This column compiles and describes, with varying degrees of specificity, what appear, to this subjective eye, to be the top 10 global employment law issues facing employers in 2015. They are listed in reverse order, as any top-10 list worth its salt should be.