crime
謫 centers on a formal accusation or blame that leads to punishment: a crime, fault, or the act of censuring someone for wrongdoing.
謫 combines 言 (speech) with 啇, which likely contributes the sound and relates to accusation or fault. The exact historical development of 啇 is uncertain.
Words (言) on the right side (啇) look like a pointed accusation: imagine someone being verbally blamed for a crime, with the sharp shape of 啇 suggesting a finger pointing in censure.
For タク, picture a tack being pinned to a criminal's record: tack -> タク, and the word (言) of accusation sticks like a sharp tack.