contact information for FBI's name check

Could somebody share information about a lawsuit due to long delay of FBI name check? Thanks.

My I-485 has been pending for two years. Recently, a senator's office inquired about my case and USCIS told the office that delay of my case is due to no clearance of my name check. Ans also, my laywer got same information. I will plan to do something for my case. Here, I share contact information for FBI's offices:

FBI phone number: 304-625-3000, FBI Email: [e-mail]

FBI Springfield: [phone], FBI Chicago: [phone]