No way to know if there any other persons to name in your lawsuit since you provided little information as to the details of your claim.. As for a Federal Tort Claims Act (FTCA) lawsuit that is always done with the United States as the defendant after you first make your administrative claim to the relevant federal agency and have that claim denied. Once you file the lawsuit you need to provide copies to the U.S. attorney for your district in Michigan and to the U.S. Attorney in Washington DC. See Federal Rule of Civil Procedure 4(i).
However, if your claim is solely that the FBI was negligent in pursuing your criminal complaint I think you will find that the DOJ will move to dismiss your complaint for failure to state a claim under Rule 12(b) and that the court will grant that motion. The FTCA does not allow for claims in which the government employee failed to execute his/her discretion properly. 28 U.S.C. § 2680(a). The decisions whether to investigate a complaint and how any investigations are to be done are acts of discretion; no federal law mandates that the FBI must investigate every complaint it receives nor does federal law specify how the FBI is to do its investigations. The law leaves those decisions to the FBI. Because it is an act of discretion you cannot sue for that under the FTCA. Thus, as a federal district court explains:
Generally, the discretionary-function exception covers law enforcement and investigatory activities. See Hobdy v. United States, 968 F.2d 20 (10th Cir.1998)(Table), 1992 WL 149871, at *2. For example, in Pooler v. United States, 787 F.2d 868, 871 (3rd Cir.), cert. denied, 479 U.S. 849, 107 S.Ct. 175, 93 L.Ed.2d 111 (1986), the United States Court of Appeals for the Third Circuit found the discretionary-function exception covered alleged deficiencies in investigative methods that led to the plaintiff's arrest. In so doing, the Third Circuit further stated: “Prosecutorial decisions as to whether, when and against whom to initiate prosecution are quintessential examples of governmental discretion in enforcing the criminal law, and, accordingly, courts have uniformly found them to be immune under the discretionary function exception.” Pooler v. United States, 787 F.2d at 871. This enforcement and investigatory discretion implicates policy factors on how to best achieve the agency's goals and mission under the statutes and regulations it is responsible for administering. See Kelly v. United States, 924 F.2d 355, 361–362 (1st Cir.1991)(noting that decisions to investigate are at the core of law-enforcement activity and are protected by the exception); Doherty v. United States, 905 F.Supp. 54, 56 (D.Mass.1995)(explaining that process of deciding how and when to seek a search warrant is grounded in policy considerations).
Cortez v. E.E.O.C., 585 F. Supp. 2d 1273, 1286 (D.N.M. 2007).
Even if you did not have that hurdle, in a tort case the plaintiff must be able to show that the defendant owed a legal duty to him/her, in this case the legal duty being to investigate the alleged crime. But the courts have generally held that the victims of crimes are not owed a duty to them individually to have the crimes against them investigated. The duty of law enforcement is one to society at large rather than to the victims personally. As a result, the victims generally do not have a good tort claim for the failure of a law enforcement agency to investigate the crimes against them.
I urge you to see an civil litigation attorney who is familiar with claims against the government to see if you have any good claims to make against either the state or federal government and what claims you might have against private persons. As you've not described the details of what your claims would be I cannot comment if there is a good claim here somewhere. Also, as the activity has been going on 20 years, some of your claims may face statute of limitations problems, and the longer you wait to act the more likely it is that more claims that you might have will be barred by the statute of limitations. All I can tell you based on what you've said here is that suing the federal government on a claim the FBI was negligent in investigating the alleged crimes against you will face dismissal because whether and how to investigate a crime is a discretionary act. You'd need to point to some failure to do something the law mandates the agency do to get past that hurdle. But even if you can't pursue that, you might have other claims you can pursue.

