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The US relies in some industries, especially, on workers who are not US citizens or residents. Workers from outside the US fill important roles in the US economy. Employers who wish to hire workers from outside of the US sometimes get a blanket L petition in order to get permission to hire employees from outside the US. In cases where such a petition has been approved, some employers may want to classify some employees as nonimmigrant L1 intra-company transferees. This is usually the case with specialized professionals, executives, and managers, who may move from position to position within an international company or may be transferred from company to company. In cases where such a worker is already covered by a blanket L petition but an employer wants nonimmigrant L1 intra-company transferee status for that employee, the employer needs to file I-129S (Nonimmigrant Petition Based on Blanket L Petition).