The last of six men convicted of a conspiracy to distribute large amounts of crystal meth in the D.C. area was sentenced last week to just under 7 years in prison, officials announced Wednesday.

Alfonso Martinez-Cruz, 39, of Mexico, was sentenced on June 22 to 81 months in prison for conspiring to distribute the crystal meth and possession with intent to distribute. He pleaded guilty to the charge in October 2011.

Five other men, all from Mexico, also pleaded guilty and were sentenced over the last two years. They received sentences ranging from just over 5 years to 16 years in prison.

All six were indicted in December 2010 on drug charges after their arrests in Georgia and North Carolina. Prosecutors said authorities seized 50 pounds of methamphetamine, six pounds of marijuana and three guns in coordinated searches on Dec. 10 and Dec. 11 in those two states. D.C. police estimate the street value of the seized drugs was more than $3.5 million.

The men had ties to the “La Familia” drug cartel in Mexico, prosecutors said.