emptyUserGroup.php

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<?php

require_once __DIR__ . '/Maintenance.php';

use MediaWiki\MediaWikiServices;

class EmptyUserGroup extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Remove all users from a given user group' );
        $this->addArg( 'group', 'Group to be removed', true );
    }

    public function execute() {
        $group = $this->getArg( 0 );

        $lb = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();

        $users = User::findUsersByGroup( $group );

        $count = iterator_count( $users );

        $this->output( "Removing $count users from $group..." );

        foreach ( $users as $user ) {
            $user->removeGroup( $group );

            $lb->waitForReplication();
        }

        $this->output( " Done!\n" );
    }
}

$maintClass = EmptyUserGroup::class;
require_once RUN_MAINTENANCE_IF_MAIN;