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Harmful algal blooms (HAB; "red-tides") of toxigenic algae are a significant threat to the functioning of the coastal marine ecosystems as well as to human health.The extent and the frequency of HAB have been on the rise in recent decades.While human-induced ecosystem stress and climate change have been implicated the underlying mechanisms are not fully understood.Biological control of HAB with interacting algicidal microbes is an attractive idea.Its application requires mechanistic understanding of the relevant algae-microbe interactions and the algae target specificity.New algicidal microorganisms are being discovered and characterized at a rapid pace, and time is ripe to ask whether algicidal bacteria might provide an ecologically and environmentally safe and logistically practicable way to prevent or disrupt algal blooms.We summarize recent research on marine algicidal microorganisms, including algicidal resources, mechanisms and methods of microbial control, ecological interactions of microbes in natural environments, and expected future developments.We hope that this synthesis serves as a framework for discussion of red tide abatement based on such alga-microorganism interactions.