How many non-partisan (independent) legislature members were in the USA compared to the USSR?

Question

How many legislature members there were who were not members of any party in the USA compared to the USSR during the Cold War and now?

Answer 1

For the USA, I guess the information is reasonably googlable. But as for the USSR, I wish to point out that the answer is: 0, both substantively and formally.

(1) Substantively: Clearly, no one who was really opposed to the CPSU was allowed to come within a shout of any political office.

(2) Formally: The "independent" candidates were actually running as part of a "Communist and Party-less Bloc" (which pretty much covers all bases). So even if they were not card-carrying members of the CPSU they were elected to the Supreme Soviet on behalf of the CPSU. I couldn't find an English reference to the bloc, but here is a Russian one from the Big Soviet Encyclopedia itself.

EDIT: Here is a contemporary reference to the bloc: http://ufn.ru/ru/articles/1937/8/b/.

EDIT: The second source I gave is a contemporary, 1937, official propaganda press release about the elections. Curiously, it was published in a physics journal (and presumably, in other journals as well). The following passage is telling:

Быть депутатом Верховного Совета первого в мире социалистического государства , состоять в железной когорте партийных и непартийных большевиков , коим доверено руководство могучей , непобедимой социалистической державой , — почетное и ответственное дело . Величайшую ответственность перед народом , перед своими избирателями должен всегда чувствовать каждый депутат.

In English (my translation):

To be a member of the Supreme Council of the world's first socialist state, to be part of the iron cohort of Party and non-Party Bolsheviks, to whom entrusted the leadership of a powerful and invincible socialist power - is a matter of honor and responsibility. Every deputy should always feel a great responsibility to his electors.

So, the deputies formed an "iron cohort of Party and non-Party Bolsheviks". I think it proves beyond any doubt that the "independents" were just as beholden to the party as the formally party men.

UPDATE: I found a 1947 election poster for the "bloc".

UPDATE: More evidence: a booklet, published in 1954, titled "The Indestructible Bloc of the Communists and the Party-less". Published by the State Press for Political Literature.