If you can actually read both Adam Smith and Karl Marx, you can find that Karl Marx quoted Adam Smith a lot in his works. For example, Marx's definition of capital is directly copied from Smith's: "A certain quantity of labour stocked and stored up to be employed (storef up labour)."
Marx in Das Kapital borrows Adam Smith's conclusion that as long as we also allow some people to control productive capital, and, again, leave others with nothing to sell but their brains and bodies, the results will be in very many ways barely distinguishable from slavery.
Noam Chomsky talks about Adam Smith recently, "The comment that you quoted, “crony capitalism,” and so on – what’s capitalism supposed to be? Yeah, it’s crony capitalism. That’s capitalism, you do things for your friends, your associates, they do things for you, you try to influence the political system, obviously. You can read about this in Adam Smith. If people read Adam Smith instead of just worshipping him, they could learn a lot about how economies work. So, for example, he’s concerned mostly with England, and he pointed out that in England, and I’m virtually quoting, he said the merchants and manufacturers are the principal architects of government policy and they make sure their own interests are well cared for, however grievous the effects on others, including the people of England.
Yes, it’s their business. What else should they do? It’s like when people talk about greedy capitalists, that’s redundant. You have to be a greedy capitalist or you’re out of business. In fact, it’s a legal requirement that you be a greedy capitalist and that you don’t pay attention to what happens to anyone else. You know, it’s not just Ayn Rand, that’s the law. So, these complaints don’t make any sense."