By essentially repealing the so-called Johnson Amendment, a tax provision that bars charities from engaging in partisan politics, the House legislation frees up big donors to funnel even more unlimited, undisclosed money into campaigns, and, for the first time, to deduct that money from their taxes. The bill also threatens the credibility and viability of charitable groups, and would drastically reduce charitable giving—even as it robs education, housing, and health-care assistance from working families who invariably will turn to charities for help.