Yes. It's a multiplier of bad laws like Jim Crow. If these capabilities had existed at the time of Jim Crow, the damage that this would have done compared to what was done would have been far worse.

TBH, the fact that black people at the time were poor and had less access to ubiquitous communication probably protected them greatly.

I hate to invoke Godwin's law, but also imagine if communications for everyday conversations and the surveillance thereof had existed in 1939.