Sanders' thing is bribing the voters with my money. Turns out, it's pretty popular, no matter the current year. Communism is a disease.
communism is not a good system, but Sanders does not support communism, he supports some socialist policies, which do make sense. The US has double the cost of healthcare compared to the next closest country. And if you work your whole life and do everything right including having health insurance why should you have to declare medical bankruptcy from getting a treatable illness? Privatization of healthcare makes absolutely no sense and there are other issues where privatization is also dumb.
If you can't understand it, it is intuitively obvious.