L-1A Visas are made for workers that work during a managerial or executive capacity. The managerial and executive designations aren't limited solely to those who supervise large enterprises or an oversized number of employees, and may put in managers of independent contractors. However this designation doesn't apply to first-line supervisors as these don't seem to be usually branded as managers unless they supervise professional workers.
For instance, a supervisor who handles shifts of hourly employees during a factory wouldn't be the most effective candidate for an L-1A visa, as USCIS may say that these production workers aren't professionals. Only a L1 Visa Lawyer Deerfield Beach is the best and reliable person to help you out.