I'm going to start with Venezuela since I am a Venezuelan-American and you might not like what my views are on the topic. First of all, I always assume good faith, even when it comes down to Sanders, unlike Michael Moore, for instance.
Sanders expressed his support of Chavez in many of his writings. So, you might not consider him a Chavista, but he's definitely praised Chavez at least up to 2011 .
I know this is anecdotal, I visited Venezuela many times: 2005, 2008, 2009, 2011, 2013. Believe me, anyone with good faith could not have praised whatever was going down there in 2011. 2000? I can give you the benefit of the doubt. Chavez had only been in office for ~3 years by the time and hadn't shown what an awful dictator he was going to become.
Have you been to Cuba? Again, this is anecdotal, but nothing like first hand experience on a matter to make some people understand what the ugly reality is outside whatever some organization states on what the state of those countries are.
Trust me, you don't want to be in a Cuban hospital.
>> No need for the government to seize the means of production
> I do not believe Sanders proposes that.
Here's a video  where Chavez is seizing the means of production on national TV.
I find deeply sad when some Americans try to justify certain candidates who have supported awful governments, like Chavez's or Castro's.
I have not been to Cuba. I hope to some day. (I speak fluent Spanish btw and hear about these places in their original, local non-US sources.) I do understand that they are said to have good health care outcomes, which is especially remarkable given how the rest of their economic system is going. The United States health care system is very terrible.
> Here's a video  where Chavez is seizing the means of production on national TV.
Yeah he does look kind of like a dumbass appropriating buildings on a whim without investigation or any kind of review (for the TV cameras and that silly applause), that was pretty much his way, but it's important to note that Bernie Sanders is not Hugo Chávez and can't be held responsible for the actions of another person, living or dead.