Oh boy,
18 different different accounts all from the same country (Kuwait) boosting the same casting suggestion (Giancarlo Esposito) and downvoting every single other suggestion, The maker of all the accounts seems to be alileek203 (the oldest account out of all of them, the voting histories are identical)
The List:
https://www.mycast.io/profiles/5678/username/alileek203
https://www.mycast.io/profiles/2853/username/ailmohammad
https://www.mycast.io/profiles/41052/username/points_amerier472
https://www.mycast.io/profiles/41043/username/justice_amerier467
https://www.mycast.io/profiles/41042/username/bobby_amerier455
https://www.mycast.io/profiles/35220/username/crazy_harleybi
https://www.mycast.io/profiles/35218/username/zoe_birds28
https://www.mycast.io/profiles/41055/username/videos_amerier493
https://www.mycast.io/profiles/41054/username/channel_amerier439
https://www.mycast.io/profiles/35211/username/hello_my_name_23