Both get hits on google.

Intimidation. Terrorism.

Street violence is a common tactic hence "strategy".

Rechtspraak.nl
... b. Art. 141 met geweld tegen personen. Groep jongeren die op straat geweld plegen
door het slaan/ schoppen van medemensen (zonder noemenswaardig letsel). ...
www.rechtspraak.nl/ reglementen/Oriëntatiepunten_straftoemeting.htm

These few examples show that you don't necessarily need a "street" to have a "street strategy". A "violent street strategy" could also mean : clashes with police forces and army but not necessarily violence against civilians.

"Street strategy: Many of the Republican Guard forces are now dispersed to minimize air strikes. But as allied ground forces approach Baghdad, they are expected to rush to dug-in emplacements already stocked with ammunition and supplies. "The basic strategy can be summed up as disperse, absorb and move to military operations in urban terrain," a defense official said."
http://pub182.ezboard.com/furbanoperationsjournalfrm15.showN...

"Unfortunately, a very well-equipped march never made it to government center/the fence in the morning, and that was because of both poor tactical planning and poor street strategy."
http://ftaaimc.org/en/2003/12/2958.shtml

"Street Strategy: After failing to force the prime minister to resign in parliament, the main opposition takes to the streets. (...)"... we are compelled to launch the protest programs in the street in order to kick it out," declared the former home minister and convenor of the central protest mobilization committee of the party."
http://www.nepalnews.com.np/contents/englishweekly/spotlight...

"Low-Key Opposition: The reality is that Iran's ruling clerics--and the roaming bands of armed vigilantes who enforce their word--are still effectively muting opposition in Iran, both in and out of parliament. Also, student leaders' tactics may be changing from street strategy to more internal, reform-minded opposition."
http://www.daneshjoo.org/generalnews/article/publish/printer...

"Panels Include: "Organizing around the Free Trade Area of the Americas: from popular education tools at home to street strategy in Miami "
http://austin.buffaloimc.org:8080/newswire/display/13663/ind...

Context: sociology

"This aspect of localism, however, coexisted with a group oriented masculine street strategy which allowed the young Asian males to move into other, potentially hostile, parts of the town.
http://www.blackwellpublishing.com/ou/Everyday_Life/sample/S...