Temporary, concerted activities performed by workers, designed to put pressure on their employer. Examples include wearing T-shirts, or donning other material with union logos and slogans, holding parking lot meetings, informational picketing, petition signing, etc. Union actions typically build in intensity if actions are not affecting change. Higher intensity union actions can include collective refusal of voluntary overtime, reporting to work in a group (I.e. clocking in at the same time at designated start times), jamming phone lines (I.e. calling high level directors to advocate), collectively clocking out on time together (I.e. leaving the building in a group at designated end times, taking a break at the same time),  march on the boss (I.e. delivering a petition as a group to high level directors or Governor appointees), etc. Union actions can lead to a strike.