Perhaps you are referring to Romans 13?
Its obvious that Romans the letter has been heavily edited,
and composed of several earlier letters.
Chapter 13 is very suspect,
and I would suggest was either:
(1) Added by despots like Constantine etc. to force a certain brand of
"Roman Law abiding" Christianity upon Christians generally, or
(2) Placed by Paul as a smokescreen to protect a vulnerable underground movement
from accusations of subversion and/or treason.
But that is what most scholars also have said time and time again.
I have a book here on the textual history of Romans and its quite an eye-opener. And its a very conservative book, not any kind of
'radical criticism' of Romans.
Similarly, 1st Corinthians is really 2nd Corinthians,
and is actually a composite of several letters by Paul.
2nd Corinthians would actually be 3rd or 4th Corinthians,
if you're counting.