I want to refer to sections of US laws in a lawsuit filed at a US federal court.
For example, I look at the INA 1965 (Immigration and Nationality Act of 1965).
The different parts of the law are described here.
Each line seems to include two names for each part of the law: for example, "INA 101" and "8 U.S.C. 1101".
What is the difference between the two names?
Why are there two names for the same section?
Which name should be used in a lawsuit filed at a US federal court?