This comes in handy:
US Code, provided by Cornell Law School
I was looking for specific language on illegal alien laws and found this:
https://www.law.cornell.edu/uscode/text/8/1325
But then I found related laws which are vary interesting:
https://www.law.cornell.edu/uscode/text ... /part-VIII
So this website is helpful and easy to use
https://www.law.cornell.edu/uscode/text