Legislative allies are widely recognized as key to social movement success, but the emergence of their alliance with activists remains understudied. This article proposes a strategic approach to this phenomenon based on the cases of the environmental, labor, and LGBT+ movements in Chile and their allied legislators. According to this approach, an alliance emerges due to two necessary conditions. Movement organizations must display tactical capacity, which signals their adaptability and competence to participate in Congress. And a socially skilled leadership creates the trust required for movement leaders and legislators to cooperate during the lawmaking process. This approach emphasizes that alliances emerge from activists’ strategic efforts to build a social tie, whose effectiveness is mediated by legislators’ expectations and congressional norms. By specifying the strategic dimension of an alliance, this study highlights the capacity of activists to foster cooperative relations with state actors.

立法盟友被广泛认为是社会运动成功的关键，但他们与活动人士联盟的出现仍未得到充分研究。本文根据智利及其盟友立法者的环境、劳工和 LGBT+ 运动案例，提出了应对这一现象的战略方法。根据这种方法，联盟的出现是由于两个必要条件。运动组织必须展示战术能力，这表明他们参与国会的适应性和能力。具有社交能力的领导层可以为运动领导人和立法者在立法过程中建立合作所需的信任。这种方法强调，联盟源于活动家建立社会联系的战略努力，其有效性由立法者的期望和国会规范来调节。通过明确联盟的战略维度，本研究强调了活动家与国家行为者建立合作关系的能力。