8. "Courts are constituted by authority and they cannot go beyond that power delegated to them. If they act beyond that authority, and certainly in contravention of it, their judgements and orders are regarded as nullities ; they are not voidable, but simply void, and this even prior to reversal." WILLIAMSON v. BERRY, 8 HOW. 945, 540 12 L. Ed. 1170, 1189 ( 1850 ).
In most cases, the EEOC can file a lawsuit to enforce the law only after it investigates and makes a finding that there is reasonable cause to believe that discrimination has occurred, and is unable to resolve the matter through a process called "conciliation." The EEOC has discretion which charges to litigate if conciliation efforts are unsuccessful, and ultimately litigates a small percentage of all charges filed. When deciding whether to file a lawsuit, the EEOC considers factors such as the strength of the evidence, the issues in the case, and the wider impact the lawsuit could have on the EEOC's efforts to combat workplace discrimination. Congress also gave individuals the right to file a lawsuit in court.
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Lawsuits can become additionally complicated as more parties become involved (see joinder). Within a "single" lawsuit, there can be any number of claims and defenses (all based on numerous laws) between any number of plaintiffs or defendants. Each of these participants can bring any number of cross claims and counterclaims against each other, and even bring additional parties into the suit on either side after it progresses. In reality however, courts typically have some power to sever claims and parties into separate actions if it is more efficient to do so. A court can do this if there is not a sufficient overlap of factual issues between the various associates, separating the issues into different lawsuits.