"red squad" meaning in English

{
  "etymology_text": "Referring to their investigations of communism during the red scare.",
  "forms": [
    {
      "form": "red squads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "red squad (plural red squads)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A police intelligence unit specializing in infiltrating, conducting countermeasures, and gathering intelligence on political and social groups."
      ],
      "id": "en-red_squad-en-noun-n~H8x53X",
      "links": [
        [
          "police",
          "police"
        ],
        [
          "intelligence",
          "intelligence"
        ],
        [
          "unit",
          "unit"
        ],
        [
          "countermeasure",
          "countermeasure"
        ]
      ],
      "raw_glosses": [
        "(US, historical) A police intelligence unit specializing in infiltrating, conducting countermeasures, and gathering intelligence on political and social groups."
      ],
      "tags": [
        "US",
        "historical"
      ],
      "wikipedia": [
        "red squad"
      ]
    }
  ],
  "word": "red squad"
}

{
  "etymology_text": "Referring to their investigations of communism during the red scare.",
  "forms": [
    {
      "form": "red squads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "red squad (plural red squads)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses"
      ],
      "glosses": [
        "A police intelligence unit specializing in infiltrating, conducting countermeasures, and gathering intelligence on political and social groups."
      ],
      "links": [
        [
          "police",
          "police"
        ],
        [
          "intelligence",
          "intelligence"
        ],
        [
          "unit",
          "unit"
        ],
        [
          "countermeasure",
          "countermeasure"
        ]
      ],
      "raw_glosses": [
        "(US, historical) A police intelligence unit specializing in infiltrating, conducting countermeasures, and gathering intelligence on political and social groups."
      ],
      "tags": [
        "US",
        "historical"
      ],
      "wikipedia": [
        "red squad"
      ]
    }
  ],
  "word": "red squad"
}