In other words, the idea is that to make trade "fair" we are going to impose a tariff on countries like Mexico, Philippines, India, etc., so that U.S. workers do not have to compete with them.

Of course, this increases the prices of consumer goods at home, so it operates as a very regressive tax, rather than progressive tax on U.S. citizens. Also, this has a devastating impact on the economics of the developing countries that we are supposedly trying to save from exploitation.

Finally, this ignores the likelihood that other foreign countries might retaliate against the U.S. by imposing tariffs on U.S. products.

So, in the end, aren't we just going down the road of Smoot-Hawley again if adopt Trump/Sanders' objections to the various trade agreements?

That being said, there are things that should be fixed, but it is far more nuanced then the way it is being portrayed by the current candidates.

I hear a lot of jargon and buzzwords like "neo-colonialism," "obligarchy," etc., but what will the candidates change? To put a fine point on it are they in favor of embargoes or tariffs?

Trump has very clearly said that he supports increasing tariffs on Chinese goods. I think Bernie also supports such a measure by opposing agreements that reduce or eliminate tariffs.