Newly declassified files have revealed that Aneurin 'Nye' Bevan, a foundational figure in the creation of the UK's National Health Service, was the subject of an extensive surveillance operation by MI5. The records indicate that the security service began tracking Bevan in the 1930s, a period during which he was rising to prominence as a vocal critic of the political establishment.

According to the released documents, the surveillance lasted for over two decades. MI5 officials categorized Bevan as a 'left-wing firebrand,' a label that justified his inclusion in intelligence monitoring during a time of significant political volatility in Europe and the UK. While the documents confirm the duration and existence of the surveillance, they provide limited insight into the specific actions taken by the agency beyond the initial identification of Bevan as a person of interest. The release of these files offers a rare glimpse into how the British state viewed influential socialist politicians during the mid-20th century, highlighting the tension between national security operations and the activities of elected officials.