I'd argue ff you have thuggery at that level in public then you have bigger problems than voting systems.
And if that's country wide then the country isn't a democracy so the voting system is moot.
In terms of voter fraud, it's the very inefficiency of paper in person voting that provides the large scale protection - it's incredibly hard to do what you describe at a national level.
On the other hand, it's much easier for organised crime to influence voting machines nationally - in an undetected way - you probably only need to intimidate a handful of key people.
And if that's country wide then the country isn't a democracy so the voting system is moot.
In terms of voter fraud, it's the very inefficiency of paper in person voting that provides the large scale protection - it's incredibly hard to do what you describe at a national level.
On the other hand, it's much easier for organised crime to influence voting machines nationally - in an undetected way - you probably only need to intimidate a handful of key people.