Definition of watchdogs:
(N) :
a fictional right-wing terrorist group appearing in American comic books published by Marvel Comics, usually as enemies of Captain America.
(N) :
"Watchdogs" is the fourteenth episode of the third season of the American television series Agents of S.H.I.E.L.D. Based on the Marvel Comics organization S.H.I.E.L.D., it follows Phil Coulson and his team of S.H.I.E.L.D. agents as they face the Watchdogs, an anti-Inhuman terrorist group.