USICS Information on L-1 Visas for Temporary Workers:

https://www.uscis.gov/forms/explore-my-options/l-visas-l-1a-and-l-1b-for-temporary-workers

USICS Information on L-1A Intracompany Transferee Executive or Managers:

https://www.uscis.gov/working-in-the-united-states/temporary-workers/l-1a-intracompany-transferee-executive-or-manager

USICS Information on L-1B Intracompany Transferee With Specialized Knowledge:

https://www.uscis.gov/working-in-the-united-states/temporary-workers/l-1b-intracompany-transferee-specialized-knowledge

USICS Policy Manual on Intracompany Transferees:

https://www.uscis.gov/policy-manual/volume-2-part-l