Do Mexican flag-wavers know what happens to illegals in Mexico?

On Friday night, we saw Sanders placards and a few communist flags at that anti-Trump rally. I guess you'd expect that at a leftist rally with Bill Ayers in attendance. It was the Mexican flags that caught my attention. I don't know for sure who was holding the flags but my reaction was the same. In other words, do these kids understand how Mexico treats illegal immigrants or even legal foreigners engaged in politics?
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