sentences:  Working time was calculated by the employer based on the time cards punched by the clocks.The employer deducted walking and preparatory time from the time cards based on the punched time and assumptions about how long prep work and walking would take on average.Seven employees and their labor union (represented by Edward Lamb) brought a class action suit under Section 16(b) of the FLSA alleging that the employer's calculations did not accurately reflect the time actually worked and that they were deprived of the proper amount of overtime compensation.