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Although he doesn't name the source behind such nefarious projects, this blogger has noticed the same phenomenon, snipers, being used in past regime-change projects. He examines their use as a part of a broader category of false flag actors who engage in violent actions in order to discredit, disrupt, and destroy anti-ruling class movements as well as regimes. If you examine closely the examples he provides, you will find that the Empire, the Empire's allies and agents, and/or its neoliberal agenda are supported in each case.
There is also a lot of evidence which suggests that in relation to governments the Empire's regime-change agents look for opportunities to extend their neoliberal empire that meet all these requirements: 1) significant popular dissent with a government as evident in protests, 2) the present targeted government functions either independent of the Empire's neoliberal agenda, doesn't adequately support such policies, or actively opposes them, and 3) the existence of Empire agents in the targeted country: CIA agents, NGO networks functioning in support of neoliberal policies, right-wing organizations and figures that can be recruited to serve Empire actions.
Then in an advanced stage of the regime-change process, the use of snipers to create panic, terror, and backlash against the targeted government becomes an effective weapon.
The current protests in Venezuela meet all the above criteria and if Empire agents can achieve more success in escalating the crisis, be on the lookout for the use of snipers to accelerate regime-change in that country.