Could you tell me when Congress, republican or democrat controlled, has ever issued an indictment. Frustrated or not, Congress does not now nor has it ever had any law enforcement power.
maybe indictment is the wrong word now, but congress does have the power to to go after corruption, otherwise who would be able to go after a corrupt justice department?
congress can also arrest people for contempt of congress.
i guess they went after all of those republicans in the past using their special prosecutors (a law which they allowed to lapse several years ago). but yes, using this special prosecutor, congress has been able to indict people.