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---
title: "Clear, specific title"
---

:::python
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:::js
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def filter_unknown_users(users: list[str], known_users: set[str]) -> list[str]:
    """Filter out users that are not in the known users set.

    Args:
        users: List of user identifiers to filter.
        known_users: Set of known/valid user identifiers.

    Returns:
        List of users that are not in the known_users set.

    Raises:
        ValueError: If users list contains invalid identifiers.
    """
    return [user for user in users if user not in known_users]