Moving them isn’t the problem. Identifying them is.
Oh no, it is VERY easy to identify them. Put an add in the paper for landscapers to come for an interview at any public building. Once all the respondents are there have ICE come in to verify citizenship. Just make sure there is a bus outside because they will all run out the door as soon as they see the ICE logo. I worked 10 years as a sales manager for a group of farmers that used mostly illegals (all with fake documents) for packing. ICE came twice in 10 years and everyone jumped out windows and doors leaving 2 or 3 of 25 packers. No, it is not hard at all to identify illegal workers.