"The military court issued 13 different sentences against the suspects, including six to death", said Nasser Sleiman, head of the military court in the Gaza Strip.
The UN General Assembly is scheduled to vote on Thursday to a USA draft resolution that condemns Hamas movement for firing rockets from the Gaza Strip into Israel.
The six condemned to death on Monday ranged in age from 29 to 55 and had each allegedly been working with Israeli intelligence for several years.
Sami Abu Zuhri, a Gaza Hamas leader, said in a statement that "the worldwide community is standing in front of a real test to prevent the US administration from violating the global laws".
Thieves Caught On Camera Stealing Salvation Army Red Kettle From Blaine Supermarket
The Salvation Army of Charleston is lacking donations this year with their Red Kettle Campaign. The suspects are facing felony possession of theft tools and damage to property charges.
Bozum during a press briefing also hailed the rulings as a "clear message" to those who would cooperate with Israel.
The Hamas spokesperson further stated, "Collaborators must realize the (Israeli) occupation will not be able to protect them".
The verdicts drew condemnation from Human Rights Watch.
Palestinian President Mahmoud Abbas, however, has refused to sign death sentences, even in the West Bank.
Huawei Nova 4 to be unveiled on December 17
The sole selfie camera here is expected to be coupled with a triple rear-camera setup as more sensors are now becoming the norm. Nova 4, from the stable of Huawei, will come with a display that has tiny round cutout to accommodate for selfie camera.
During the 2014 war with Israel, a firing squad from Hamas's armed wing killed six men accused of collaborating with the Jewish state.
In May 2017, Hamas security forces invited journalists to attend the hanging in Gaza City of three men convicted over the assassination of a senior military commander of the Islamist movement.
The execution of the death sentences in Gaza takes place in spite of legal disputes over the matter. Hamas says the defendants were implicated in previous incidents.
Girl gets suspended for bullying, father makes her walk to school
His 10-year-old daughter Kristen was suspended from using the school bus after she was bullying other students on two occasions. They "seem to show a great deal of empathy towards some of the sad stories that I read with them", Mr Cox said.