Commentary Democracy took a big blow when Twitter shut down President Donald Trump’s accounts and Google and Amazon ousted Parler, a site favored by millions of conservatives. Big Tech, which is run by the left, is robbing Americans of their right to communicate freely and exchange ideas. The nation’s founders worried that the government would use its power to censure and crush competing viewpoints. Their remedy was the First Amendment, guaranteeing all of us freedom of speech and association and barring government censorship. They had no way of anticipating that tech companies would grow more powerful than governments and have the monopolistic ability to suppress or cancel political viewpoints. Yet, Facebook and Twitter now “wield the unchecked power to remove people from platforms that have become indispensable for the speech of billions,” explains ACLU lawyer Kate Ruane. And Google, now the eponym for all internet searching, suppresses content by placing …