SANTA CLARA, Cuba — Cuban opposition activist Guillermo Farinas ended his 134-day hunger strike Thursday, following signs the communist government is making good on its promise to release 52 political prisoners.

Farinas drank sips of water at a hospital near his home in the central city of Santa Clara, said Licet Zamora, a spokeswoman for the 48-year-old psychologist and freelance journalist. Zamora described Farinas' condition as "grave" after he recently suffered a potentially fatal bl...