There are ample instances of GOP authors who admit that voter "restriction" ("suppression" seems to be an obscene word in this context) laws were intended to reduce the number of Dem votes. They have been effective, especially in rural and blighted urban areas where historical voting patterns have shown were heavily Dem. These laws were pushed by the GOP, using voter fraud as justification, to reverse the Voting Rights Act of 1965, which banned legal barriers (state laws) that kept blacks from being able to vote.They studied ways that Dem voters exercised their rights and developed strategies to target them.
These restrictions made voting more difficult for many people, and included: require some form of state approved ID, restricted week-end/pre-election day voting, ended same day registration, expanded the periods of time between registering and election day, closed/reduced the number of polling places in heavily Dem areas, restricted the hours of voting, cut the number of poll workers, stationed armed uniformed voting enforcement agents at polling places. These laws may not have intentionally stopped blacks from voting but they disproportionately impacted black and latino voters
When challenged in court, judges agreed these laws were unconstitutional...
Maybe when all is said and done, antiquated voting processes which makes it difficult to vote and which can lead to fraud throughout the country, red and blue alike, will be corrected.