a group of persons, businesses, etc., united for a particular purpose.

a group of legislators, usually of both major political parties, who vote together for some particular interest

the farm bloc.

a group of nations that share common interests and usually act in concert in international affairs

the Soviet bloc.

noun

alliance , cabal , ring , faction , allied group , association , confederation , leaguenotes:a bloc is a group of countries in special alliance while a block is an obstruction , an interruption , or a rectangular area or shape , anschluss , cartel , coalition , confederacy , federation , league , organization , union , combination , party , clique , group