Citing a non-existent “one man one vote” principle, eight Warren Court black-robes ruled that state legislative districts must be of approximately equal populations.
At the time, Senator Dirksen of Illinois warned that Chicago would come to dominate Springfield. He was right; due to Reynolds, Illinois is near bankruptcy and losing population as people flee high taxes, higher unemployment, and societal destruction.
It definitely needs to be revised and repealed if the right test case can be found! It would solve a lot of problems for a dozen states or so.