Officials with The Southern Alameda County Major Crimes Task Force say when a team of local police and state investigators served warrants on two homes in Newark and one home in Fremont they found a combined 642 marijuana plants.
Also seized in the raids on Thursday was one loaded shotgun and a loaded handgun, as well as several high-capacity ammunition magazines.
The homes raided in Newark included a house on the 6000 block of Marguerite Drive -- a residential neighborhood of modest homes -- and a home less than a mile away on the 5000 block of Robertson Drive.
The third location raided was a home on the 33000 block of Lake Lanier Place in nearby Fremont.
In the Fremont raid, officials say agents found about 300 plants, as well as two pounds of marijuana that had already been processed, and another 40 pounds of marijuana that was cut and was drying.
Two of the three men arrested in the raids were taken into custody at that home. They were identified as 27-year-old Patrick Alexander of Sacramento and 22-year-old Antonio Rodriquez, described as a transient of Fremont.
In the raid of the home on Marguerite Drive in Newark, authorities arrested 31-year-old Ryan Hardin.
Besides facing charges of cultivating marijuana and possessing marijuana with the intent to sell, all three suspects are also facing grand theft charges for allegedly diverting electrical service to help grow the marijuana. Hardin is also facing weapons charges.
All three men were being held in Santa Rita Jail in Dublin.
Members of the task force that conducted the raids are part of a combined team of local police, California Highway Patrol officers and state Department of Justice agents targeting gang and drug activity.