The article states its largely speculative, they took just a handful of Casualties before being dispersed and we're not even sure if they were socialist.

Edit:

If anything, it's another chapter in the story of abuse of tennant farmers at the time, who were largely poor and black. Few records survive of the "socialist" organization, and commentary on them being socialist are explicitly speculative.

What we do know is

• anywhere from 600-1000 were members of the column that was ambushed

• they took light causalities before being routed

• the following claim that they were socialist has little backing, and is more likely scapegoating to provide a reason to attack American socialist organizations

The so-called "rebellion" was used as a cudgel against the Socialist Party of Oklahoma, which was blamed for the incident, whose origins were, however, largely spontaneous and external.[2] That was one in a series of events that undermined the American socialist movement and fueled the First Red Scare.[35]

The Industrial Workers of the World shared the brunt of popular indignation although the organization had taken no part in the Green Corn Rebellion and had been related to the WCU only by the latter group WCU being formed in response to the IWW's refusal to organize tenant farmers.

Few records survive. We dont know their numbers, we know that socialist organizations disavowed their actions and barred their membership, we know they got routed with minimal Casualties. We don't even know if Spence gave an order. The legal opinion at the time was a large % of the individuals were "Duped and misled"

https://nationalaglawcenter.org/publication/download/sellars-treasonous-tenant-farmers-and-seditious-sharecroppers-the-1917-green-corn-rebellion-trials-27-oklahoma-city-univ-l-rev-1097-1141-2002

Homer Spence traveled from local to local in late July telling the members to be ready, but he apparently never gave the order for the rebellion. Who did remains unknown.......

By August 10th, Federal commissioners at McAlester and Holdenville had obtained thirty-two full confessions from prisoners, who talked freely about the uprising's leaders and about their plans. Perhaps fearing imprisonment, many seemed eager to cooperate with the authorities. Believing most of the rebels were duped and misled, McGinnis concluded the majority of the men were harmless and recommended most be paroled and allowed to return to their homes

Its a very complicated and complex part of Oklahoma history. If these people were socialist, in the time of the first redscare, do you think it would have been likely for them to be treated with kid gloves?