The Griffith Amnesty International group is hoping locals will when they host a Letter Writing Marathon on Saturday, December 7 at Griffith Central from 10am to 2pm.

Amnesty International has been campaigning for individuals at risk since 1961 and letters written on behalf of individuals have proven to make a difference.

Write for Rights is Amnesty International's annual campaign where people in more than 70 countries come together to write letters to and on behalf of prisoners of conscience and people at risk for human rights violations.

Griffith group spokesperson Tanya Kassman said it was easy for locals to help.

"Our group only formed in Griffith four months ago so this is our first real campaign," she said.

"We are basing our campaign on two people that we are writing letters for.

"Write for Rights coincides with Human Rights Week which includes 16 days of action from November 25 to December 10."

Through the letter writing marathon Griffith Amnesty International will demand a full investigation for Miriam Lopez, from Mexico, who was tortured, raped and falsely imprisoned for seven months.

They also want to see the release of Ethiopian journalist, Eskinder Nega, serving an 18 year prison sentence for 'terrorism' after criticising the government and supporting free speech.

"Ultimately we want to keep writing letters until these people are released." Griffith Amnesty International group member Brett Naseby said.

"We will have letters and stories at the stall on Saturday, so people can simply sign the letter. It is as simple as signing a petition. If people feel passionate enough they can write their own letters and there is also an online option.

"The good thing about this is there is no financial commitment, we just need these letters to make a big difference."