Who do the deaths in Act 3 suggest about justice in "Richard III"?
Richard's body count piles up in Act 3, as it will continue to do so for the rest of the play. Rivers, Gray, Vaughan, and finally Hastings all bite the dust. And why? Because none of them will support the campaign to make Richard the king. And is any of this legal or just? Not a chance.
Here's Hastings on the situation of England, shortly before Hastings is killed:
O bloody Richard! miserable England!
I prophesy the fearful'st time to thee
That ever wretched age hath look'd upon.
Come, lead me to the block; bear him my head.
They smile at me that shortly shall be dead.
Clearly, there isn't any actual justice on earth: Richard is just removing everyone who stands in his way. But as each of the people who die point out as they go to their deaths, Margaret has planted curses on them, but also on Richard. Clearly - and the play bears this out - Margaret's curse is going to come true of Richard too, and his life will be cut short.