In the field of political science, the concept of gerrymandering refers to "a conscious effort by the leaders of the political system to move or change boundaries in the interest of winning the next election."

A more universal definition by Wikipedia is: "Gerrymandering is a form of redistricting in which electoral district or constituency boundaries are manipulated for an electoral advantage."

The 40,000 people march which happened peacefully last weekend, planned by Bersih, is for a freer and fairer general election and was designed to protest apparent gerrymandering in Malaysian elections.

To really understand the issues, one must first figure out who/what Bersih is.