Sean “Diddy” Combs’ ex-girlfriend, Cassie Ventura, began what could be a days-long testimony in Combs’ sex trafficking trial Tuesday, alleging on the witness stand Combs had subjected her to physical abuse and coerced her to participate in “freak off” sex performances. (Here is a complete list of the allegations against Combs).

Sean "Diddy" Combs is on trial for allegedly leading a criminal organization that operated through sex trafficking, kidnapping, forced labor and violence over the course of 20 years, per federal prose...