gang

(noun) an association of criminals. Synonyms: pack, ring, mob. Examples: "Police tried to break up the gang." "A pack of thieves."

(noun) an informal body of friends. Synonyms: crowd, crew, bunch. Examples: "He still hangs out with the same crowd."

(noun) an organized group of workmen. Synonyms: crew, work party.

(noun) tool consisting of a combination of implements arranged to work together.

(verb) act as an organized group. Synonyms: gang up.