Six players have been charged with offences committed in round two of the 2015 Super League.
Hock is charged with Grade C use of the knees on Tommy Makinson in the 53rd minute and Grade B use of the knees on Mose Masoe in the 61st minute.
Two Catalans Dragons players have been hit with charges, after their often bad-tempered clash with Castleford Tigers on Saturday.
Eloi Pelissier has been charged with Grade B striking with the shoulder on Scott Wheeldon in the 35th minute of the contest. Olivier Elima is charged with Grade B repeated punching in the 35th minute.
Castleford’s Jake Webster has been charged with Grade A punching in the same incident.
Crabtree has been charged with making Grade A dangerous contact on Liam Farrell in the 25th minute of the same fixture.
All six players were charged after the incidents were considered by the RFL Match Review Panel, which also issued a formal caution to Mickey Paea of Hull FC for use of the knees on Warrington Wolves player Daryl Clark in the fifth minute of the match played on Friday February 13.
Crabtree, Powell and Webster have until 11am on Tuesday to submit Early Guilty Pleas (EGP).
Hock, Pelissier and Elima do not have the option of submitting EGPs and will appear before an independent disciplinary tribunal on Tuesday evening.