Conversation so far:
Where was Frank Hague commissioner?
Frank Hague was commissioner in Hudson County.
What years was Frank Hague commissioner?
Frank Hague was commissioner from 1913 to 1917.
How long was Frank Hague commissioner?
Frank Hague was commissioner for five years.
What were some noteworthy things that happened while Frank Hague was commissioner?
Frank Hague immediately set about reshaping the corrupt Jersey City police force with tough Horsehoe recruits. Hague spearheaded crackdowns on prostitution and narcotics trafficking, earning him favor with religious leaders.
Did the Fire and Police departments get along with Frank Hague as commissioner?
Frank Hague took steps to curb the police department's lackadaisical work ethic, punishing offenses that had gone unpunished for years. He also made much-needed improvements to the fire department
What did the Police and Fire Departments do when Frank Hague made much-needed improvements?
In 1917, Frank Hague, as the man who cleaned up the police force, ran for reelection. He put together a commission ticket, sweeping all five spots on the commission.
Who did Frank Hague work closely with?
At the heart of this change was an inner cadre of officers known as the Zeppelin Squad or zepps who were personally loyal to Frank Hague alone.
Was Frank Hague ever betrayed by a Zepp?

Question: Who did the Zepps spy on?
Self-contained rewrite: Who did Frank Hague's Zepps spy on?