What’s hidden ? There are congresscritters openly promoting communism
What's hidden is the real nature of communism. Slick politicians like Bernie Sanders and AOC portray it as kindness and love, taking care of others. Who could be against helping the children? etc. Communism is painted by marxist politicians and media lackeys as all things good, a mixture of sunshine and puppies.
Anyone who has even the slightest sense of history, however, knows that communism isn't any of that. Communism is Stalin's purges with millions murdered and Mao's collectives where tens of millions starved. It's Pol Pot's Khmer Rouge and murderous madmen like Che Guevara in Cuba. Communism is the enforcement of central planning by your betters though ever increasing brutality in the name of the "common good", a common good that always enriches those in power and impoverishes everyone else.
The facts of communism has been whitewashed and erased from the history books. I doubt 1 of 100 could tell you how many people died due to communism in the twentieth century (well over 100 million). If you listen to the authoritarians in the democratic party you'd think gun crime was an epidemic, yet you could add up all the firearms murders by criminals in the 20th century and it wouldn't come close to a fraction of the number of people murdered by communism. Democrats will tell you that the greatest threat to your life is your neighbor owning a gun, history shows the greatest threat to life is being ruled by a communist government.
Most of those who saw communism up close and personal are dead. Those left have no idea of the real horrors of communism thanks to schools that don't teach real history and a news media that peddles outright falsehoods. It's not that communism is being hidden, it's that people don't believe it's true nature. It's the snake that you think you can pet until it bites you in the jugular.