This is just plain bizarre. Proletarian expropriation is defined in the blog entry as a "form of civil disobedience intended to represent a form of protest against a disproportional raise of prices and despite stagnating or lowering personal income."
In other words, stealing.
Civil disobedience can be a powerful tool used to undermine and then repeal unjust laws. But these loons are going into stores and restaurants and not paying for the goods and services because they think the prices are too high. But, thankfully, they make sure to leave a generous tip to the waiter. After all, he's part of the Proletariat I guess.
The ridiculous thing about this is that thinkers take this crap seriously, as if there were a real issue here. The blog entry at TransAtlantic Monthly has several paragraphs considering the legal ramifications, likely court responses, and whether this stealing is okay if the folks redistribute to those in need.
I should note that the blog entry is from a Serbian and all the episodes of proletariat stealing that are mentioned take place in Italy. Those wacky Europeans still think communism is going to make a comeback I guess. Though, I could see this happening in San Francisco.