That would largely be my understanding, Oswaldovitch saw this as a way to contribute to the Revolution and he wanted Gus Hall as his lawyer?
He wanted John Abt not Gus Hall. Abt was a defense lawyer who had represented many Marxists accused of violating American laws.
Abt was an important member of the CPUSA, although he denied being a member at that time; and there's no evidence that I've seen that Oswald knew about his membership. Abt was also a key member in the late 1930s and 1940s of the so-called "Ware Group", a group of spies (some of them) for the Soviets. This was a major group working on behalf of Moscow. It was made famous by the claims made by Whittaker Chambers about Alger Hiss (among other things).
It's funny, though, that I think if Oswald knew that Abt was a member of the CPUSA he, Oswald, may not have wanted him to represent him. Oswald was very critical of the CPUSA - he wrote that it had betrayed Marxism for its slavish support for Moscow. So he may have viewed Abt more critically than he did.
Oswald was adamant about wanting Abt. Until he found out whether Abt would represent him, he didn't want anyone else. This is what Lou Nichols, the head of the Dallas Bar Association at the time, said Oswald told him. These claims that Oswald was denied a lawyer are simply false. He didn't WANT one until it was determined whether Abt would or could represent him. Turning away a lawyer who said he wanted to meet Oswald is NOT denying Oswald a lawyer since there is no evidence that Oswald wanted anyone other than Abt. Not at that time.