The environmental activist Daniel McGowan has been sent back to prison. McGowan was taken into custody Thursday just months after his release to a halfway house following over five years in prison for his role in two acts of arson as a member of the Earth Liberation Front. In his case, the judge ruled he had committed an act of terrorism, even though no one was hurt in either of the actions. Supporters say his return to prison may be linked to an article he published just this week decrying his treatment. The article for The Huffington Post cited court documents showing he was held in secretive and highly restrictive prison units known as Communication Management Units, or CMUs, in retaliation for his political speech. In a statement, McGowan’s attorneys said: “If this is indeed a case of retaliation for writing an article about the Bureau of Prisons retaliating against his free speech while he was in prison, it is more than ironic, it is an outrage.”