as long as its under $10,000 its pretty easy to transfer cash to people, it avoids a lot of the money trafficking laws which are aimed from 10k and above, depends how much cash we are talking about, the easiest way to is involve a 3rd party to withdrawal the cash and make it look like a normal transaction for something and have the intended person pick up the cash in person
but western union is not one of them, the stuff you have to provide for them is insane, i did it once to get cash for sale in the early 2000's before paypal was more of a thing and never again...
now its mostly used for immigrants to send money home urgently or for scammers to steal money from people
back in the early 1900's western union was a valuable tool for people and it was widely used but not as much now