English proverb to describ someone who sucks up to his superior unscrupulously...

[David1999]

Is there any proverb in english to describ someone who sucks up to his superior unscrupulously and gives hard time to his subordinate without morality.

This is not personal experience but would like to know if such a proverb exists.

[Kitosdad]

No proverb but ;

Be nice to people on the way up, because you are going to meet them on the way down.
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