NPR - how to lie by ommission on behalf of Republicans

NPR reported on Congressional Republicans trying to impeach the IRS commissioner for investigating conservative groups. As usual in NPR's reporting on this, they totally ignore that the IRS also investigated liberal groups for which there was reason to believe they were breaking the law & defrauding tax payers by claiming tax exempt status for which they were not eligible. Over the several years since this became an issue, NPR has only reported a very, very few times w/o reporting it as if they only investigated conservative groups.