Many were moved on GUM-HNL to the point .E+ was more crowded than E.

Recently I asked the FA if I could move from my assigned 21A to 20F because a standby passenger got 21B & this would permit 21B to take 21A and me to have an empty 20E next to me. FA said yes. Standby passenger in 20B started yelling at me until the other passengers in my original row came to my defense. United should get a handle on unruly rogue standbys.