system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Was there any clones that were against Order 66 and ideas of Palpatine and Vader?
gpt
The true answer is "most of them."

The vast majority of the clones never would have willingly fired on their Jedi commanders (I say 'most' because there were a few notable exceptions, specifically Pong Krell, whose soldiers mutinied against him on Umbara long before Order 66 happened). The clones were outfitted with inhibitor chips in their heads that could override their free will and make them kill the Jedi regardless of their wishes...which is exactly what happened,>!as we were just shown on the newest episode of The Clone Wars (which covers Order 66 from Ahsoka Tano's perspective during and immediately after the Seige of Mandalore)!<.

These chips have been known to malfunction, setting off the Jedi-killing order prematurely (in the case of Tup), and at least one clone (Fives) learned about the chips' true purpose but was framed and shot before he could reveal it to the Jedi and the Clones at large. But largely, neither the Jedi nor the Clones were aware of the chips, their ability to override the free will of the Clones, or the orders contained on them; if they were aware of the chips, they were told that they "supposed to prevent you from being aggressive, like your source, Jango Fett" and that "Jedi Master Sifo-Dyas instructed us to implant them during your growth cycle." Neither of those things were true, but the Clones that knew and asked were given that answer.

Since Order 66 was issued by the Chancellor, the supreme commander of the Republic armed forces, due to their inability to disobey the clone troopers carried out the Chancellor's command. Though a small percentage of clones successfully ignored the order and some fought against it >!(we see Captain Rex, Anakin's second-in-command, actively fighting the compulsion before he gives in and tries to kill Ahsoka)!<, the vast majority of the clones executed their unsuspecting Jedi commanders without question; though Order 66 apparently applies mostly to "Jedi leadership," in practice Palpatine's order was an order for the genocide of all Jedi, including Padawans, initiates, and younglings (one of the more notable examples being the murder of Depa Billaba and the narrow escape of her young Padawan, Caleb Dume).