Hi! Well, in order to choose a good title, first you have to decide on what aspect/area of labour law you want covered in your dissertation. You can pick out any topic from your current/past university syllabus that you are well versed with (something to do with labour laws of course.) Here are a few good examples/topic ideas:
-Child labour laws
-Employer's contract and fundamental rights of the worker
-History of labour laws (From the Buckingham and Carnatic Mills strike in 1921 to the Harthal in Kerala in 2012)
-Benifits available to workers (compensation for injury, etc)
-Discrimination in pay (on the basis of s*x)
Hope anything helps!