Efficacy and Safety of Glecaprevir (ABT-493)/Pibrentasvir (ABT 530) (GLE/PIB) in Combination With Sofosbuvir and Ribavirin in Participants With Hepatitis C Virus Who Did Not Respond to Treatment in a Previous AbbVie Clinical Study

* Male or female subjects must be adults (18 years of age or older) or adolescents (12 to less than 18 years of age weighing at least 35 kg). * Subject must have experienced virologic failure during or after treatment with ABT-493/ABT-530 in an AbbVie HCV parent study. Subjects who have experienced virologic failure during or after receiving ombitasvir/paritaprevir/r + dasabuvir (3D), or ombitasvir/paritaprevir/r (2D) in an AbbVie HCV parent study may be enrolled at AbbVie's discretion. Treatment in the parent study must have been completed or discontinued at least 1 month prior to the Screening Visit. * Subjects must be able to understand and adhere to the study visit schedule and all other protocol requirements. * Cirrhotic subjects must have compensated cirrhosis, (Child-Pugh score of ≤ 6) at Screening and no current or past evidence of Child-Pugh B or C Classification or no clinical history of liver decompensation, including ascites noted on physical exam, hepatic encephalopathy or esophageal variceal bleeding. * Cirrhotic subjects must have absence of hepatocellular carcinoma (HCC) as indicated by a negative ultrasound (US), computed tomography (CT) scan or magnetic resonance imaging (MRI) within 3 months prior to Screening or a negative US at Screening.

* History of severe, life-threatening or other clinically significant sensitivity to any study drug or drug component. * Female subject who is pregnant, breastfeeding or is considering becoming pregnant during the study or for 4 months after the last dose of study drug, or as directed per the local RBV label, whichever is more restrictive. * Recent (within 6 months prior to study drug administration) history of drug or alcohol abuse that could preclude adherence to the protocol in the opinion of the investigator. * Positive test result at Screening for hepatitis B surface antigen (HBsAg). * Screening laboratory analyses showing calculated creatinine clearance \< 30 mL/min. * Discontinuation from the AbbVie HCV parent study for reasons other than virologic failure (e.g., non-adherence, lost to follow-up, and/or the occurrence of an adverse event). * Receipt of any HCV treatment after failing the treatment regimen in the AbbVie HCV parent study.