Famously, some spy-satellites from the KeyHole series developed and operated by the US National Reconnaissance Office, where similar in capabilities to the Hubble Space Telescope, but then pointed at the earth rather than out into the universe. What can you tell me about these satellites? What era were they developed? Are they still active, and what are their approximate capabilities thought to be?
The Keyhole series of spy satellites were developed and operated by the US National Reconnaissance Office (NRO) during the Cold War era. These satellites were designed for intelligence gathering and were equipped with high-resolution optical cameras and other sensor systems. They were similar in capabilities to the Hubble Space Telescope, but instead of observing the universe, they were aimed at the Earth for the purpose of gathering intelligence information.

The Keyhole series of satellites is believed to have been active since the 1970s and some sources indicate that they may still be active today. However, the exact capabilities of these satellites are classified and not publicly disclosed by the US government.

It is believed that the Keyhole series of satellites provided valuable intelligence information on military and strategic targets, such as missile launch sites, weapons development facilities, and other critical infrastructure. They also provided detailed imaging of political and military developments in various countries, which helped inform US foreign policy decisions.

Overall, the Keyhole series of spy satellites played an important role in the intelligence gathering activities of the US during the Cold War and beyond, and their exact capabilities are thought to be highly advanced even by today's standards.
List a few of the sources that indicate the program may still be active today, and to what extent. 
If there isn't any reliable data on the subject, talk about other large-scale satellite intelligence programs still operating today and the impact they have.