What words refer to betraying someone to his enemies?

betray, double-cross, stab in the back, sell out, sell someone down the river,

What words refer to telling secrets to an enemy?

blab, inform on, rat on, snitch, squeal, tattle,

What words refer to the action of betraying someone?

betrayal, sell-out, treachery, treason,

What words refer to a person who betrays someone?

betrayer, collaborator, informant, informer, Judas, rat, renegade, saboteur, snitch, squealer, subversive, tattle-tale, traitor