The Steelers' decision to sign Michael Vick is already receiving some serious backlash in Pittsburgh.

Over 15,000 fans have put their name on a petition calling for the team to get rid of Vick, who signed a one-year deal with the Steelers on Tuesday.

From the petition:

Michael Vick is a convicted felon and no-class piece of crap. He is also a terrible QB which is why he has no team.  Let's united as Steeler fans - as NFL fans - and stop him from playing on our team! Steelers fans united! Sign to keep Vick from ever wearing the coveted Steelers uniform!!

As of 4 p.m. ET on Wednesday, 15,463 people had signed the petition.

The fans are upset because of Vick's past: In 2007, the former No. 1 overall pick was sentenced to 23 months in a federal prison for running a dogfighting ring in Virginia. Vick served 21 months of the sentence in a Kansas prison before spending the final two months under home confinement.

The Michael Vick backlash is starting in Pittsburgh. (USATSI)
The Michael Vick backlash is starting in Pittsburgh. (USATSI)

A lot of fans in Pittsburgh feel that Vick hasn't paid his debt to society, something that coach Mike Tomlin is aware of. 

"You are sensitive to those potential things, but we are going to do our due diligence," Tomlin said on Wednesday. "Rest assured that we have done that. Also, rest assured that he has done a lot since some of the things that he has gone through. His track record to this point speaks for itself."

Besides the Change.org petition, there's also an Anti-Vick group on Facebook that was set up by Steelers fans. That group, which is called "Pittsburghers against Michael Vick," had over 13,043 'likes' as of Wednesday afternoon.

Although the petition and the Facebook page both seem to be surging in popularity, the same can't be said for actual, physical protesting.

Only five people showed up to protest Vick's first practice with the Steelers on Wednesday. 

This isn't the first time that Vick has faced backlash. After signing with the Eagles in 2009, several fans had T-shirts made that said the following.