Groves hired [[J. Robert Oppenheimer]] as scientific manager under Groves' supervision. Later, Groves testified for Oppenheimer in opposition to revocation of his security clearance by Congress. Congress revoked Oppenheimer's security clearance anyway. | Groves hired [[J. Robert Oppenheimer]] as scientific manager under Groves' supervision. Later, Groves testified for Oppenheimer in opposition to revocation of his security clearance by Congress. Congress revoked Oppenheimer's security clearance anyway. |