2 sentences for 徒 (tú — wrongdoer)

1. 警方严厉打击不法之徒。

   jǐng​fāng yán​lì dǎ​jī bù​fǎ zhī tú.

   The police are cracking down hard on lawbreakers.

   Source: Dong Chinese Dictionary

2. 那个无耻之徒竟然在光天化日之下撒谎。

   nà gè wú​chǐ zhī tú jìng​rán zài guāng​tiān​huà​rì zhī​xià sā​huǎng.

   That shameless scoundrel had the audacity to lie in broad daylight.

   Source: Dong Chinese Dictionary