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...