Are you trying to write a period-correct Captain America story or just have questions about NYC in the 1930s-40s in general? The tumblr Steve Rogers Is Historically Accurate is here to help.
The anti-Communist Captain America was ret-conned into being a crazed history graduate student named William Burnside who had himself surgically altered and then dosed with a flawed version of the Super-Serum, which drove him insane to the point where he saw communist sympathizers everywhere. The subtext isn’t particularly thick here: the “Commie-Smasher” was a paranoid wannabe, whereas the real Captain America is the “living legend of WWII” waiting in suspended animation during the Second Red Scare, who emerges back onto the scene with the arrival of the New Frontier and the Great Society. - Why Captain America Is the Progressive-Era Superhero We Need.
How Steve Rogers copes with being woken up into a world he never made, seventy years after being frozen in ice: diary comics. (SLTMBLR)