That sample nested array is invalid. Assuming you meant something like this:
[
[
{
"USERID": "ID###1",
"LN": "lastname1",
"FN": "firstname1",
"Org": "OrgCode1",
"Email": "email address1"
}
],
[
{
"USERID": "ID###2",
"LN": "lastname2",
"FN": "firstname2",
"Org": "OrgCode2",
"Email": "email address2"
}
],
[
{
"USERID": "ID###3",
"LN": "lastname3",
"FN": "firstname3",
"Org": "OrgCode3",
"Email": "email address3"
}
]
]
Then you could just use a Select as shown below. Note that the Compose contains the data shown above. The expression used is:
first(item())

The output of the Select would be:
[
{
"USERID": "ID###1",
"LN": "lastname1",
"FN": "firstname1",
"Org": "OrgCode1",
"Email": "email address1"
},
{
"USERID": "ID###2",
"LN": "lastname2",
"FN": "firstname2",
"Org": "OrgCode2",
"Email": "email address2"
},
{
"USERID": "ID###3",
"LN": "lastname3",
"FN": "firstname3",
"Org": "OrgCode3",
"Email": "email address3"
}
]
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