The AFL , the American Federation of Labor, focused on collective bargaining. Established in 1886 they used strikes as a major tactic to enact change.
American federation of labor
The most commonly used tactic by terrorist is suicide bombing
Marketing Penetration is a pricing tactic when a product is introduced at a much lower price than it will be sold for to gain new customers. This is a commonly used tactic to increase sales volume or market share.
There are many tactics that the VietCong used in the Vietnam war. The most common tactic used was surprise attacks and ambushes due to extensive tunneling underground.
One fighting tactic that was used in the Revolutionary was was guerrilla warfare. It's kind of like a hit and run tactic, as in a surprise attack, an ambush, etc.
Methane (natural gas) is the most commonly used gas for residential heating. In rural areas where there are no pipes carrying natural gas and in recreational vehicles, propane and butane are commonly used.