Federal prosecutors are investigating Block, the fintech company owned by Jack Dorsey, which includes Cash App and Square, for processing transactions that may have violated U.S. sanctions and involved terrorist groups. The inquiry stems from allegations that Block processed thousands of transactions involving countries under economic sanctions and multiple cryptocurrency transactions for terrorist organizations. Former employees have cooperated with the investigation, submitting 100 pages of documentation to support these claims. As a result of these allegations, Block's stock fell by 8.0%.